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Topic Review (Newest First)
07-03-2013 10:30 PM
theblackyj i
02-24-2012 08:32 PM
Chemicalman Wow !!!!
02-24-2012 08:02 PM
illuminati thanks everyone for the imput, didnt meen to start no arguments!
02-24-2012 07:40 PM
Yjpower94 20 dollar glass pack thrush from advanced. No cat and I put the muffler where the cat was. Cheap easy and loud haha. Oh I have a 2.5l. And I got a new tail pipe it was like thirty bucks or so.
02-23-2012 02:27 PM
Xpress
Quote:
Originally Posted by VinceTj View Post
is the Banks exhaust manifold is any good? what kind of electric fan? any part number please?
Quote:
Originally Posted by VinceTj View Post
what kind of air intake?
You will have to do some googling to find out for sure. The electric fan upgrade has been done countless times, do a forum search, there's a tutorial on one of these websites somewhere.

Since nobody really makes a bolt on air intake for a 2.5L engine, you have to make it. But it's the cost of some inexpensive PVC piping, some PVC pipe glue, and a clamp on high flow air filter. You have to make some small vacuum joints for a couple of crank breather filter hoses though.
02-23-2012 02:25 PM
Xpress
Quote:
Originally Posted by Dutch 95 View Post
Lol...First Xpress...don't take life so seriously...bud. It's apparent you took some GREAT offense to some perceived attack at you. However, that was not the case at all. Heck even saying weigh the cost versus the gain made you mad? Really? Just because we don't agree, doesn't mean we need to be rude to one another.
I haven't taken offence. I am putting out well known facts around the Jeeper community.

Quote:
You really don't know how much I know, so you should really keep that garbage to yourself also. My only point is that I personally wouldn't put all that money into it.

I know quite well how airflow works. That's why I mentioned the larger diameter 4.0 L throttle body replacement.
You don't know that. Now you're making blatantly wrong accusations about someone you have little to no knowledge about.

Quote:
As for your apparent grief over me saying get a Walker exhaust for value.
Apparently you take everything I say as a "grief statement". Here is where you are wrong, yet again. I was stating I picked one up for $46 to replace my old busted up muffler. When it comes in, you better believe there will be a post from me about it. For $46 though, you can't go wrong..

Quote:
Get a 4.0 or 350 for high performance. LMAO...you went and got a Walker today for $46 but your mad at me for suggesting it? WTF? "Get a 4.0 or 350" was only intended as lightheartedness, to powder puff so that in the case your feelings were easily hurt, you'd, hopefully, realize there was no ill intent. Not sure what else to say about that.
High Performance... In a Jeep? It's a Jeep, not a sports car!

Quote:
While you will notice the hp gain on a 2.5, it will never be a powerhouse or in anyway high performance without investing a comparatively ridiculous amount of money for the little gain. Perhaps our idea of "powerhouse" is different. Sorry for that disagreement. While I'm not sure what the beef is with that, you should be mad a AMC not me".
I never said it will be a powerhouse. I said it can be a "small powerhouse" of sorts. Investing $500 or so to improve how your engine performs is something that can be well worth it. Some of us actually like small 4 cylinder powerplants.

Oh, and another thing. Adding all of these power modifications actually increases your gas mileage. You don't have to run it as hard anymore, so you can expect to gain 1-2mpg. And if your 2.5L engine is already tuned up and running like it should from the factory, then your 18mpg can actually go up to 20mpg.

Quote:
And, since my 1995 Jeep YJ still has the 2.5L in it I'm not sure why I can't be a fair judge of it's performance with 33" tires 4:10 gears, CAI and factory exhaust (which I"ll agree isn't "high flow"). Minus the 6 hp from the high performance exhaust, when your on a long incline, you have to shift down to 3rd gear or it slowly falls on it's face". So I guess if you don't want to have to downshift on a long incline, I guess that high flow exhaust would come in handy for carrying your powerhouse to the top of a paved hill.
Again, I never said it was a powerhouse. You should learn how to read before you start posting incorrect information. A Cold Air Intake alone is worthless. Like mentioned, you can't have more air flowing in unless more air can flow out. 5-6hp is about as good as it gets for intake/exhaust mods. If your engine is worn and tired then you might only see 3-4hp. Which, regardless, is still adding power onto your engine that it didn't have before.

Keep in mind I'm running a 3.54 rear end on my Jeep right now, which is essentially similar to running 33" tires. It's not bad, not hardly at all. I've driven worse.

Quote:
Since I've owned it for almost 2 year, I wouldn't say that my dismissal of the 2.5 is immediate. I have no idea what you mean by "This is the clear winner at everything" or what you are referring to.
It's not a clear winner at anything, but neither are the 6 cylinder engines. What I am implying is that the 2.5L isn't as bad as a LOT of Jeepers make it out to be. Seriously, do you know how annoying it is to come into a thread and see everyone putting it off as a "weak, gutless boat anchor" without them actually knowing ANYTHING about the engine?

It's good that you have the 2.5L engine, because you can actually have a say in its performance. Is it a V8? No, not at all. But it's plenty sufficient to push a Jeep around town and on the highways.

Quote:
In all fairness, you never said a single thing about adding the 4.0L throttle body or 19 lb injector until your list in my bitch letter above, and as you pointed out yourself, with airflow, airflow is two ways. You can't get more out than you put in and likewise you can't put in what you can't get out. Without that very modification, all other mods that you had mentioned previously (minus the 6 lb fan sucking hp) would be voided entirely by the smaller diameter of the 2.5 L throttle body.
All of this is known information. You should head over to 4 Banger Jeep every once in a while to see what us 2.5L enthusiasts are up to. It's rather informative, everything there is to be known about the 2.5L is on that website. Everything from electric fan upgrades to turbo charging.

And you can still bore out the 2.5L throttle body if you wanted to. However, most experienced 2.5L modifiers know that the 2.5L TB is big enough to prevent restrictions to a bit more airflow.
02-23-2012 07:07 AM
cronz
Quote:
Originally Posted by Dutch 95
Some people know more than they say, and unfortunately, some say more than they know.
Cheers to being the champion at passive/aggressive forum posting Dutch!!
02-23-2012 01:07 AM
Dutch 95 Some people know more than they say, and unfortunately, some say more than they know.
02-23-2012 12:25 AM
Dutch 95 My apologies to the OP for this whole mess, I was just trying to answer your question. But...if you want an honest answer, that was all I wanted to help you with. That being said, I'm going to ask:

Xpress, you didn't really say which of these hot mods you currently run on your own YJ (pics would be helpful). Can you enlighten us ALL? With all of due respect, which of these mods that you've listed do you currently have installed, and was the hp AWESOME? If you, admittedly, bought the exact $46 dollar exhaust that I suggested in the first place TODAY (YESTERDAY AT THIS POINT), I'm curious how that worked out with all of your other mods you have.

I'm also a bit curious how you consider aerodynamics to be a determiner in hp of an engine that will run w/o wind on a stand, and yes they can really do that.
02-22-2012 10:21 PM
Dutch 95 I'm sure he's a fine fellow and I'm happy he enjoys his equipment! It's his and he can do with it as he pleases. LOL...I really don't care what he thinks of my knowledge or ability. It's easy for him to say but hard to prove. And had he mentioned all of the mods, wouldn't have even disagreed with the possibility of the 20 hp gain. And he's welcome to settle in wherever he wants. It's what makes his Jeep his and my Jeep mine. I'm hoping to put a 350 in this year oh and thanks to the handy list, now I know I have to change the trans and wiring harnesses (maybe even a transfer that will handle the hp, SYE, and different front and rearends). No really...I didn't know all that. Truthfully, I wasn't offensive in my opinion but I'm not here to fight or make trouble for anyone so it is what it is. Dang I'd have loved to pick up that Blazer in the worst way. Whole drive train could have been used. Well...it was nice to meet ya d5string!! Ya seem like a nice fella. That's my 2.5 cents
02-22-2012 09:52 PM
DirtyRob Illuminati, I took my cat off, and replaced it with a small glasspack. It is a little louder than I wanted but it doesn't sound bad at all. I got some gain in power, but mine was clogged. I don't know if that would be legal in your area for inspections, but I get away with it here. If you cannot, get a high-flow cat and a standard muffler. I see no real "impressive" gains from an expensive exhaust system alone on the 2.5. People will hear you bwaaaaaaaaaaa, bwaaaaaaa, bwaaaaaaa, and then see how slow you are moving which is kinda funny. Stealth is much better IMO

Dutch, There has been some posts lately that offend some of the 2.5 die hards. I think Express is a good guy, and doesn't mean anything by it, but him and others get upset when we bash the 2.5's even if we own one ourselves.
I have tried to speak my voice too, and some are convinced that even though I own a 2.5, and a few 4.0's I do not know what I am talking about.
I own both, and drive all of them regularly. The 2.5 is nothing what others make it out to be in real life. I wish they would drive a 4.0 that is tuned as well as their 2.5's and really compare. I will never own another 2.5 personally.
They kinda remind me of a retarded mule......(the 2.5 that is).......they are tough, and wanna work, but they don't have all of what you need to really do it without working the crap out of them
02-22-2012 09:16 PM
Dutch 95 Lol...First Xpress...don't take life so seriously...bud. It's apparent you took some GREAT offense to some perceived attack at you. However, that was not the case at all. Heck even saying weigh the cost versus the gain made you mad? Really? Just because we don't agree, doesn't mean we need to be rude to one another.

You really don't know how much I know, so you should really keep that garbage to yourself also. My only point is that I personally wouldn't put all that money into it.

I know quite well how airflow works. That's why I mentioned the larger diameter 4.0 L throttle body replacement.

As for your apparent grief over me saying get a Walker exhaust for value. Get a 4.0 or 350 for high performance. LMAO...you went and got a Walker today for $46 but your mad at me for suggesting it? WTF? "Get a 4.0 or 350" was only intended as lightheartedness, to powder puff so that in the case your feelings were easily hurt, you'd, hopefully, realize there was no ill intent. Not sure what else to say about that.

While you will notice the hp gain on a 2.5, it will never be a powerhouse or in anyway high performance without investing a comparatively ridiculous amount of money for the little gain. Perhaps our idea of "powerhouse" is different. Sorry for that disagreement. While I'm not sure what the beef is with that, you should be mad a AMC not me".

And, since my 1995 Jeep YJ still has the 2.5L in it I'm not sure why I can't be a fair judge of it's performance with 33" tires 4:10 gears, CAI and factory exhaust (which I"ll agree isn't "high flow"). Minus the 6 hp from the high performance exhaust, when your on a long incline, you have to shift down to 3rd gear or it slowly falls on it's face". So I guess if you don't want to have to downshift on a long incline, I guess that high flow exhaust would come in handy for carrying your powerhouse to the top of a paved hill.

Since I've owned it for almost 2 year, I wouldn't say that my dismissal of the 2.5 is immediate. I have no idea what you mean by "This is the clear winner at everything" or what you are referring to.

In all fairness, you never said a single thing about adding the 4.0L throttle body or 19 lb injector until your list in my bitch letter above, and as you pointed out yourself, with airflow, airflow is two ways. You can't get more out than you put in and likewise you can't put in what you can't get out. Without that very modification, all other mods that you had mentioned previously (minus the 6 lb fan sucking hp) would be voided entirely by the smaller diameter of the 2.5 L throttle body.

I apologize for causing your obvious grief.
02-22-2012 04:55 PM
VinceTj what kind of air intake?
02-22-2012 04:54 PM
VinceTj is the Banks exhaust manifold is any good? what kind of electric fan? any part number please?
02-22-2012 01:11 PM
Xpress
Quote:
Originally Posted by Dutch 95 View Post
LOL...really? Your going to turn a 105 (carb)-115 (fuel injected) hp motor into a "powerhouse" with airflow? 5 lawn tractors out horse power a 2.5.
First of all, it's 112hp for a CJ 2.5L engine. We're in the YJ section, we are talking about the TBI 2.5L engine which has 117hp factory, the MPFI engine has 120hp factory. Netting 5hp is absolutely going to change how the engine behaves, especially going uphill. You're taking a 117hp engine and adding 5hp to bring it up to 122hp. That's already ahead of the MPFI engine.

Allowing an engine to breathe better is the first thing that should always be done, and yes it actually improves performance numbers!!!! Take a look at many ATV's: Most of the newer ones come with a closed intake system that breathes trough the upper support tube and lets air in front of the tank. Slap on a Yosh or Motowerks exhaust and you should expect as much as 6hp right? Yes, but no. Not until you open up your intake by removing the airbox lid and installing a high flow air filter.

Airflow is a 2 way road with engines. You can put the biggest air filter you can find on the intake, but that doesn't mean jack if it can't send that increased airflow out through the small volume exhaust vehicles are equipped with. And visa versa. It takes a high flow air filter AND a performance exhaust system to net HP gains. An exhaust itself may only add 5hp-ish but to see the real benefit of added airflow you have to ditch the stock, restrictive airbox for an aftermarket intake system that really lets the engine breathe.

Quote:
As for the 20-25 hp number, that is a load of bunk!!!! If you converted to the 4.0 throttle body, you may get "minimal gain" and it's apparently an easy bolt on conversion and I believe it uses the same sensors. Since the throttle body is larger diameter it will allow more air into the engine.
Seems you forget that the 2.5L engines are equipped with a 6lb metal fan that literally SUCKS horsepower away. EVERYONE that has done the electric fan upgrade has reported better throttle response, more power on the highways, a quieter ride, and even dyno sheets have shown it can free up as much as 10hp. I've seen some go as far as 15hp, but realistically you're looking at netting about 10hp. So, coupled with the exhaust system, you're already looking at a 15hp net in power. 15 hp is a LOT of power for a small 4 cylinder engine. You're going from having to downshift out of 5th going up freeway grades to now being able to cruise up that same grade in 5th gear.

Quote:
I have a 09 Mustang with 20,000 miles that had 200 hp when I started. I went from single exhaust to dual exhaust, added a CAI, and tuned it and I "may" have gotten 25 horsepower gain. There is NO WAY you will gain 1/5th the horse power from the mods you described.
Totally different vehicle, totally different aerodynamic properties, totally different engine. Apples to oranges. Next.

Quote:
Definitely weigh the cost versus the gain. In 2002 when they stopped using the 2.5, they were multi-port fuel injected and still only had 120 hp.
Not everyone wants to go through and put in a 6 or 8 cylinder engine. 2.5L Jeeps are inexpensive and a dime a dozen. Some people report finding them for $2000 or less, and needed only a little basic maintenance to be running like new (because the PO's are idiots when it comes to cars). The power modifications I am talking about would cost one anywhere from $500-$1000. Still less expensive than an engine swap.

Keep in mind for a (legal) engine swap you need:

-Engine
-Transmission
-Wiring harness
-Smog referee inspection
-Smog approval

All of which can add up depending on where you find the engine, what condition it is in, the transmission and its condition, pricing for a smog referee to inspect your work and approve it, not to mention passing emissions testing.

Realistically, it's $1500 or more, even if you did manage to pickup a wrecked vehicle.

Quote:
For value go with Walker. For high performance go with a 4.0 Jeep or Chevy 350. LOL.
I bought a Walker today. Cost me $46 out the door. You don't need to drop in a 6 or 8 cylinder engine when you can spend a little money and upgrade what is already there.

Here is a list of parts that have been PROVEN to gain hp numbers on the dyno:

1987-1990

-High flow air intake.
-Borla headers, full performance exhaust.
-Electric fan
-Throttle body spacer
-Performance ignition coil

Max total HP gains: 30hp
Realistic HP gains: 20-25hp

1991-1995

-High flow air intake.
-Borla headers, full performance exhaust.
-Electric fan
-Throttle body spacer
-Performance ignition coil
-Ford 19lb injectors
-4.0 throttle body
-Bore out intake to match 4.0 throttle body.

I wouldn't expect you to know that, someone who puts off the 2.5L immediately and sees it as a boat anchor and instead looks at an engine with 2 more cylinders and immediately thinks "This is the clear winner at everything". Going up steep grades perhaps when comparing stock to stock, but when you do some simple upgrades to a 2.5L engine you'd be surprised at just how well it can pull, even with 33" tires on the stock 4.10 gears.
02-22-2012 09:16 AM
Dutch 95 LOL...really? Your going to turn a 105 (carb)-115 (fuel injected) hp motor into a "powerhouse" with airflow? 5 lawn tractors out horse power a 2.5. As for the 20-25 hp number, that is a load of bunk!!!! If you converted to the 4.0 throttle body, you may get "minimal gain" and it's apparently an easy bolt on conversion and I believe it uses the same sensors. Since the throttle body is larger diameter it will allow more air into the engine.

I have a 09 Mustang with 20,000 miles that had 200 hp when I started. I went from single exhaust to dual exhaust, added a CAI, and tuned it and I "may" have gotten 25 horsepower gain. There is NO WAY you will gain 1/5th the horse power from the mods you described.

Definitely weigh the cost versus the gain. In 2002 when they stopped using the 2.5, they were multi-port fuel injected and still only had 120 hp.

For value go with Walker. For high performance go with a 4.0 Jeep or Chevy 350. LOL.
02-22-2012 12:37 AM
Xpress Believe it or not, a high flow performance exhaust system, equipped with good headers, can actually net you as much as 5-6hp. Not a lot, but you can't do one thing to a 2.5L and expect it to turn into a ferrari. Couple that with a throttle body spacer, high flow intake, and the electric fan mod and you're looking at about 20-25hp of power gains that actually turn the 2.5L engine into a small powerhouse that will not only perform better on the roads, but pull harder on the highways and going uphill.

However, if all you're going to do is an exhaust, then just get an inexpensive clamp on muffler.
02-21-2012 11:58 PM
Dutch 95 Go to the local autozone and get the pre-bent WALKER exhaust system (extremely easy to install) for your Jeep, with a few clamps. If you can give the 2.5 any noticeable power gain from ANY exhaust system, I'll kiss your feet, eliminate the letter "E" from the alphabet, and admit that "MY WIFE OF 20 YEARS IS ALWAYS RIGHT". LOL...a Magnaflow system may make it sound LOUD and somewhat nice (a matter of opinion, I'm sure), but come on....like a V8 (NOT LIKELY)? Not too mention, the complete waste of money for a LOUD exhaust that will only annoy you in the long run. Trust me. In a Jeep, you don't need a new noise while you try to take a drive. The expense of that will NEVER do what you expect. There NO WAY I'd spend money on it!!! If you have no intention of making this some kind of extreme machine, and given the fact that it only has the 2.5 L, I doubt that you do. The 2.5 will only EVER BARELY have the power to pull a greased string out of a cat's keester.
02-21-2012 10:56 PM
natax
Quote:
Originally Posted by illuminati View Post
i was thinkin a magna flo cat with flomaster mufler keepin the same pipes new too this just askin thanks
Magna flo has great products. Make that I4 sound like a V8 and might improve performance as well. I think that would be a good choice.
02-21-2012 10:08 PM
illuminati
Quote:
Originally Posted by VinceTj View Post
bump
bump
02-21-2012 08:16 PM
illuminati i was thinkin a magna flo cat with flomaster mufler keepin the same pipes new too this just askin thanks
02-21-2012 07:34 PM
VinceTj bump
02-21-2012 06:41 PM
illuminati
95 yj 2.5 exhaust replacement

i gotta leakin cat and muffler lookin for a cheap replacement but good brand, any sugestions? I wanta go hi flo exaust on the cheap!

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