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Old 09-27-2013, 05:40 PM   #1
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Any REAL benefit to adding both intake system AND exhaust ?

Just looking over some intake systems (like Airaid Maximum MXP, afe Momentum GT, etc) and exhausts (Flowmaster, Magnaflow) and just wondered how you guys that have added those kind of products liked the end result ? Extra boost to HP, acceleration, MPG, different "sound" to your Jeep ?? Easy-ish install ?? (I mean for less-than handy person) Anyway, thanks in advance for any info/opinions !!

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Old 09-27-2013, 05:42 PM   #2
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The only benefit you will gain really is just sound mainly. There might be a hp difference but will be in the single digits.

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Old 09-27-2013, 05:44 PM   #3
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What benefit are you looking for? Don't plan on feeling any added horsepower, other than "placebo HP". If you're looking for a different sound, you'll get that. If you're looking to improve your mileage, try changing your driving style, since the vehicle is already designed to squeeze out the maximum mileage from it's current configuration.
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Old 09-27-2013, 05:44 PM   #4
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you'll get an extra boost in hp in the powerband but thats it. mediocre hp gains for a large sum of money aint worth it since the pentastars are optimally tuned in the factory. forced induction/ and a good tune is the only possible solution and will equate to a huge boost in performance.
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Old 09-27-2013, 05:58 PM   #5
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Originally Posted by Justgot2hunt View Post
Just looking over some intake systems (like Airaid Maximum MXP, afe Momentum GT, etc) and exhausts (Flowmaster, Magnaflow) and just wondered how you guys that have added those kind of products liked the end result ? Extra boost to HP, acceleration, MPG, different "sound" to your Jeep ?? Easy-ish install ?? (I mean for less-than handy person) Anyway, thanks in advance for any info/opinions !!
ONE OF THE BEST (sorry to yell) reasons to upgrade your muffler/exhaust system is to get rid of the bulky rear muffler. This can be done with a muffler or a system. I run a K&N filter system and one of our cat-back systems. I get a lot of people asking "What's under the hood?" The gains from a muffler/exhaust (on the 2007-11) was as mentioned high single digit/low double digit for our systems.
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Old 09-27-2013, 06:02 PM   #6
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I have intake and muffler. I doubt either individually or both together made any difference in power. I like the sound though, and I love that the muffler is now smaller and moved higher up.
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Old 09-27-2013, 07:56 PM   #7
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Old 09-27-2013, 08:04 PM   #8
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Old 09-27-2013, 08:11 PM   #9
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I agree with Dynomax guy, I HATE the look and placement of the stock exhaust. It's like a UFO hiding under the rear under of the jeep, plus it's pretty easy to hit when climbing over stuff. And besides, a jeep should have a little noise to it, and the stock exhaust is too restrictive. I went with a 200$ Dynomax off road evolution exhaust, removed the whole exhaust system up to the Y pipe and the exhaust sits up and out of the way behind the rear axle. Better clearance, sounds real deep and throaty, and was dirt cheap, what else could you want? As for intakes... Forget about it, won't do enough to justify 300$ as it doesn't do much for noise or performance.
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Old 09-27-2013, 08:12 PM   #10
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if your pulling more air in with the intake, it is better to have more air flow out which would consist of headers all the way back. As far as hp, you will see minimal gain. It will sound better. Just keep out of the raspy rice sound. Small gain for alot of $.
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Old 09-27-2013, 08:42 PM   #11
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Honestly apart from sound you aren't going to notice anything. A good intake and exhaust (and a tune) will net you maybe 15hp. You MIGHT be able to feel that a little in a 4000+ pound vehicle, but mainly you'll notice is sounds a lot better.

You're not going to start getting really noticeable gains unless you're talking full intake, throttle body, intake manifold, headers, cat-back exhaust, and a tune. That's going to run you around $2500 bucks if you do all the work yourself, and it'll be about 40hp on the pentastar. It will also void the hell out of your warranty and you will lose some low end torque to make the high-end gains.

I could see puddles, mud, and deep snow causing issues as well since such an intake system is not going to be sealed as well as the stock one.

A previous poster mentioned that if you just do the exhaust, you'll get a nice sound improvement and improve your rear clearance. That's true, and that's the route I'd take. Avoid the intake, because it wont do anything without a tune, and then your engine warranty depends on whether you have a nice service rep.
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Old 09-27-2013, 11:19 PM   #12
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I could see puddles, mud, and deep snow causing issues as well since such an intake system is not going to be sealed as well as the stock one.
Not correct... First, there are plenty of intake systems sealed the same way as the factory one. But most importantly, your wrangler will be destroyed if you ever get water up to the intake area. Water in the intake will be the least of your worries at that point. Maybe the old wranglers could handle it, but not the JK.
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Old 09-28-2013, 03:47 PM   #13
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What benefit are you looking for? Don't plan on feeling any added horsepower, other than "placebo HP". If you're looking for a different sound, you'll get that. If you're looking to improve your mileage, try changing your driving style, since the vehicle is already designed to squeeze out the maximum mileage from it's current configuration.
I was mainly thinking sound difference and HOPING maybe for a MPG or 2. My driving style is pretty tame and mostly highway usually. Thanks for the reply !
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Old 09-28-2013, 03:49 PM   #14
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Old 09-28-2013, 03:52 PM   #15
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I agree with Dynomax guy, I HATE the look and placement of the stock exhaust. It's like a UFO hiding under the rear under of the jeep, plus it's pretty easy to hit when climbing over stuff. And besides, a jeep should have a little noise to it, and the stock exhaust is too restrictive. I went with a 200$ Dynomax off road evolution exhaust, removed the whole exhaust system up to the Y pipe and the exhaust sits up and out of the way behind the rear axle. Better clearance, sounds real deep and throaty, and was dirt cheap, what else could you want? As for intakes... Forget about it, won't do enough to justify 300$ as it doesn't do much for noise or performance.

Thanks, may be the next mod I line up. Pretty much leaning towards just the exhaust. Thanks, I appreciate the reply. Also like the avatar, though a wrangler definately can't be called a truck IMHO.
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Old 09-28-2013, 03:54 PM   #16
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Once again, thanks for all the replies. I appreciate the honest advise !
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Old 09-29-2013, 08:28 AM   #17
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Magnaflow also offers a "rock crawler" design exhaust. It relocates the muffler so its out of the way. Just another option out there. I purchased one of these for my jeep. I cant help you out on how it sounds because im still waiting for my jeep to be built.
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Old 09-29-2013, 03:30 PM   #18
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Old 09-29-2013, 04:20 PM   #19
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Once again, thanks for all the replies. I appreciate the honest advise !
I did intake/exhaust plus a larger throttlebody. I noticed with the viper throttlebody that there`s less downshift in my 2010 auto which improved mpg by 1 or 2. I can get 20mpg hwy.
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Old 09-29-2013, 04:51 PM   #20
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I don't think anyone mentioned the Mopar "Cold Air Intake" option



which I assume will enable you to keep your warranty (if installed by the dealer?).
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Old 09-29-2013, 04:56 PM   #21
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I don't think anyone mentioned the Mopar "Cold Air Intake" option



which I assume will enable you to keep your warranty (if installed by the dealer?).

It's an AEM air intake......also under the name Rugged Ridge, Mopar etc.
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Old 09-29-2013, 05:03 PM   #22
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im interested in doing a dual catback, and possibly a short ram intake. i would THINK that most you would get out of it would be a few HP and ALOT better and meaner sounding jeep.
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Old 09-29-2013, 05:33 PM   #23
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Not correct... First, there are plenty of intake systems sealed the same way as the factory one. But most importantly, your wrangler will be destroyed if you ever get water up to the intake area. Water in the intake will be the least of your worries at that point. Maybe the old wranglers could handle it, but not the JK.
I'm not talking about submersion. I'm talking about excessive splashing. I've run open-air elements before and the filters always wore out and needed to be cleaned and re-oiled MUCH faster than normal. That was just driving in some snow and on a few gravel roads and getting the filter splashed when I hit puddles (yes it had a shield under it but things would splash up somehow). The things people do with their Jeeps, I could definitely see it being an even bigger issue. Probably wont actually hurt anything, but you'd be cleaning that filter all the time unless you got one that was enclosed in a box the way the OEM one is...and then what's the point, you're not going to get better performance if you've still got the filter enclosed like that....





Getting back on topic...unless you're going to run a true open-element intake that flows so much more air that it requires a computer re-flash, you're not going to get any noticeable gains.
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Old 09-29-2013, 05:40 PM   #24
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i have both the AFE 2.5" RB exhaust and the open box AFE intake. very happy with both. AFE just released a newer version of their RB exhaust with a larger muffler so the sound will be a lot quieter and more ideal for most. but i am beyond happy with my set up. let me know and ill message you the part numbers of everything i have
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Old 09-29-2013, 06:02 PM   #25
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Honestly apart from sound you aren't going to notice anything. A good intake and exhaust (and a tune) will net you maybe 15hp. You MIGHT be able to feel that a little in a 4000+ pound vehicle, but mainly you'll notice is sounds a lot better. You're not going to start getting really noticeable gains unless you're talking full intake, throttle body, intake manifold, headers, cat-back exhaust, and a tune. That's going to run you around $2500 bucks if you do all the work yourself, and it'll be about 40hp on the pentastar. It will also void the hell out of your warranty and you will lose some low end torque to make the high-end gains. I could see puddles, mud, and deep snow causing issues as well since such an intake system is not going to be sealed as well as the stock one. A previous poster mentioned that if you just do the exhaust, you'll get a nice sound improvement and improve your rear clearance. That's true, and that's the route I'd take. Avoid the intake, because it wont do anything without a tune, and then your engine warranty depends on whether you have a nice service rep.
"Header? This ain't no import lol. You need to start doing research on the pentastar motor. 40hp on a pentastar with bolt ons and a tune? I think not.
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Old 09-29-2013, 06:17 PM   #26
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You feel a difference with a intake, exhaust and tuner... And it's decently noticeable. Now, I said I would never run any of these things on a jeep again but here is how they all ended up on my vehicle.
1. Superchip was used to re calibrate my tire size for my speedometer.
2. Afe high tuck was used to get rid of the low hanging muffler
3. Intake was swapped out with an customers s&b when he needed a stock intake to run a snorkel
Now, would I have paid an arm and a leg for this stuff for hp gains...absolutely not, but they all ended up on there for different reasons. The last thing I added was the exhaust and I did notice there was a bit more pep in my step but to reiterate, not enough for me to buy this stuff for hp gains, they all kinda became a matter of funtion when building and wheeling...and the intake was free.
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Old 09-29-2013, 06:22 PM   #27
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"Header? This ain't no import lol. You need to start doing research on the pentastar motor. 40hp on a pentastar with bolt ons and a tune? I think not.
I've built up my Mustang GT doing all the work myself short of the parts of the exhaust that needed welding.....so I don't know why you brought up imports. I got a dyno tested 65hp doing full bult ons and a dyno tune. To be fair, a small portion of that was likely due to the fact that my rims/tires shaved almost 11 pounds off of each corner of the car, and I also had a 20lb lighter driveshaft.

40hp (at the crank, not wheels) is a very realistic upper limit on what you could get out of a pentastar with full bolt-ons and a re-flash. Intake, throttle body, intake manifold, header(s), catback, open mufflers and a dyno-tune to run on 93 octane. 40hp is pretty realistic for all of that. The only problem I could see is whether anybody produces a quality replacement intake manifold - that's what got me the most gains on my vehicle.

Like I said, if all you did was intake/exhaust/tune you're not gonna get more than 15hp.
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Old 09-29-2013, 06:53 PM   #28
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I'm not talking about submersion. I'm talking about excessive splashing. I've run open-air elements before and the filters always wore out and needed to be cleaned and re-oiled MUCH faster than normal. Probably wont actually hurt anything, but you'd be cleaning that filter all the time unless you got one that was enclosed in a box the way the OEM one is...and then what's the point, you're not going to get better performance if you've still got the filter enclosed like that....
The mopar CAI is oil free. Dubbed dry flow. Put about 15,000 on it, desert sand storms, mountain passes, snow, muddy roads, monsoon rainstorms, etc. No issues and it wasn't even that dirty. Cleaning it almost felt like a waste of time after I rinsed it out and not much came out. Probably a good thing I did anyway because of microscopic debris I couldn't see, but I was surprised how clean it was.

So my experiences are different with the dry flow filter. I did notice (oiled) K&N's/ Banks attracting a ton of dirt and needing much more maintenance than this new style whether it be on a gasser or diesel or open or enclosed box. And I've never wore out a CAI filter (100,000 on the diesel and 100,000 on the XJ). I always followed the cleaning instructions and used the proper cleaning kits though. Maybe that's what's a factor?
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Old 09-29-2013, 07:03 PM   #29
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The mopar CAI is oil free. Dubbed dry flow. Put about 15,000 on it, desert sand storms, mountain passes, snow, muddy roads, monsoon rainstorms, etc. No issues and it wasn't even that dirty. Cleaning it almost felt like a waste of time after I rinsed it out and not much came out. Probably a good thing I did anyway because of microscopic debris I couldn't see, but I was surprised how clean it was.

So my experiences are different with the dry flow filter. I did notice (oiled) K&N's/ Banks attracting a ton of dirt and needing much more maintenance than this new style whether it be on a gasser or diesel or open or enclosed box. And I've never wore out a CAI filter (100,000 on the diesel and 100,000 on the XJ). I always followed the cleaning instructions and used the proper cleaning kits though. Maybe that's what's a factor?
Ah, the dry filter probably makes all the difference. Mine requires oil and it collected gunk super fast if I drove in dusty environments, and it was especially bad in Germany winters...there would be all sorts of crap stuck to the filter.

I didn't wear it out, I just cleaned and re-oiled and it was like new. But I ended up doing it about 4 times as often as recommended simply because it collected so...much...shit. I'm sure part of it was also that I replaced the grille with an open-bar one that let a lot more air under the hood. After deleting the foglights and putting the open grill on there (as well as a front splitter that forced air up under the hood) I was collecting an inordinate amount of crap from the road.

There's probably a lot less air-flow under the hood of a Jeep....I'd still be worried about excessive amounts of splash from mud snow and water if I was running an open element filter but that's just me. If these dry filters really are that awesome I might actually look into one...anybody know the flow numbers compared to stock?
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Old 09-29-2013, 07:03 PM   #30
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Quote:
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I've built up my Mustang GT doing all the work myself short of the parts of the exhaust that needed welding.....so I don't know why you brought up imports. I got a dyno tested 65hp doing full bult ons and a dyno tune. To be fair, a small portion of that was likely due to the fact that my rims/tires shaved almost 11 pounds off of each corner of the car, and I also had a 20lb lighter driveshaft. 40hp (at the crank, not wheels) is a very realistic upper limit on what you could get out of a pentastar with full bolt-ons and a re-flash. Intake, throttle body, intake manifold, header(s), catback, open mufflers and a dyno-tune to run on 93 octane. 40hp is pretty realistic for all of that. The only problem I could see is whether anybody produces a quality replacement intake manifold - that's what got me the most gains on my vehicle. Like I said, if all you did was intake/exhaust/tune you're not gonna get more than 15hp.
3.6 pentastars exhaust manifolds are cast directly into the cylinder heads. Like I said " lol".

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