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rich1014 02-22-2007 05:03 PM

Borland Cat Back on a TJ
I'm thinking about putting a Borland Cat Back exhaust system on my 05 tj (4.0). Anybody done this? Installation looks like a snap - I'm more interested in what power/economy/sound is like.

TXST8tj 02-22-2007 05:11 PM


most of the systems made for TJs are pretty easy to install with the clamps and stuff. personally, i prefer a welded exhaust system. cost more to do, but there are less issues down the line.

the borla exhaust isn't very loud, but has a decent sound. a dynomax or flowmaster muffler are going to be louder and deeper if that's something you're looking for.
economy-wise, you probably won't notice much, if any difference in mpg savings.
power, you might notice a little seat of the pants power.

here is a soundclip of it.....
(click download and then I agree and it will start to play)

Tdad 02-22-2007 09:34 PM

I have a full Borla exhaust. If it ever needs replacing it won't be with another Borla system. Poorly designed, poor fitting and overpriced, IMO.
I'd look at Flowmaster or Magnaflow.

Buster 02-24-2007 10:46 AM

I have been running the Borla catback for about 3 years with no problems. I would not recommend ths Borla header Tdad said, it is over priced and has some fit issues (especially in the 97 to 99 years). Just my .02

stevin33 03-09-2007 12:11 PM

seems as if most people lean towards the flowmaster.
does anyone know what the difference between the flowmaster 40 and the 50's are?

TXST8tj 03-09-2007 10:05 PM

the 40 is going to be a bit louder, and probably have a better tone overall. to get a similar effect as the 40 series, the 50 series really is best on a larger engine.

there are better mufflers out there, but flowmaster like other product brands are household names and usually get the uneducated vote. people buy brands they hear a lot, even if it's crap such as sony products. flowmaster isn't crap, but it's not the greatest thing since sliced bread. i'll tell you, i'd buy flowmaster before i bought borla though.

Triple88a 03-09-2007 10:24 PM

i got a 50.. I have the stock tailpipe on but its quite low. If i had the choise i would get the 40 since its a bit higher pitched. As loudnes goes the tailpipe makes difference in that. Shourt pipe will be really loud. When i installed my 50 delta i did not install the tailpipe and it was loud enough to shake my seats at idle. :) The only problem i had with my muffler was i had to cut the stock tailpipe off since i couldnt get it out and also the clamp in front of the muffler (by the catalystic converter) in preatty bad shape so i had to cut it and then had to use a tool to rip off the stock muffler since it the clamp was so tignt on there it actually deformed both pipes with little humps.

50 delta muffler with stock tailpipe - all 3 movies are different

AzTJ 03-09-2007 11:27 PM

what about magnaflow? I have a couple of Jeep'n friend that run them and they sound great!

Triple88a 03-10-2007 12:29 AM

When i was shopping for an exhaust i did look at Magnaflow but i didnt want my TJ to sound like my old sports car so i skipped it.

Take a listen (clip 1 and clip 2)

TXST8tj 03-10-2007 10:51 AM

i'm personally a fan of Dynomax.

stevin33 03-26-2007 12:02 PM

so what is the best sounding exhaust?

Buster 03-26-2007 03:35 PM


Originally Posted by stevin33 (Post 65841)
so what is the best sounding exhaust?

Not trying to be a smatt a$$, but that really depends on what sound you prefer.

stevin33 03-26-2007 04:10 PM

c'mon now.....
you know what a good sounding jeep sounds like when you hear one.....
something that doesn't sound like a honda civic w/ a folgers coffee can for an exhaust.

jp'rs_peep'rs 03-27-2007 11:22 AM


Save the money!
Run on down to your loc'l stab and grab and get yourself a cheap china bob made muffler system for 99.99 and put that de'r on. Because you'll prob rip it off out in the brush.


cnt487 03-27-2007 01:06 PM

I gotta agree with TX on the Dynomax. I just installed one on my 98 TJ and I'm quite pleased.

Triple88a 03-27-2007 06:58 PM

I love the sound of open hearders.. too bad its too loud if i run it on a trail somewhere you will hear me in massachusetts lol.

mrbigjeep 03-27-2007 11:16 PM


Originally Posted by stevin33 (Post 65841)
so what is the best sounding exhaust?

IMO flowmaster

Triple88a 03-28-2007 01:54 AM


Originally Posted by bigjeep (Post 66290)
IMO flowmaster

On a big engine only though lol :) If i have the choise now id get the 40 instead of my 50 delta.

stevin33 03-28-2007 07:07 AM

now the 40 is slightly louder/throatier than the 50..??
or do i have it the other way around?
and when you say a big engine, are you refering to the 4.0?

Triple88a 03-28-2007 09:43 AM

yes the 40 is a bit louder but its also higher pitched.. the lenght of the tail pipe can also control the loudness of the muffler.
The 50 delta is lower pitched so its deeper and a bit quieter but if you dont have a tailpipe installed it is loud as hell.. i didnt install my tailpipe when i first installed my delta so it shook my seats at idle so it was way too loud and was probably going to get a ticket so i installed my stock tail pipe, sometime soon i will install a 2.5" tailpipe that i have laying around and ditch the stock 2.125 (1/8)".
If you want your muffler to be loud you can probably cut your stock tailpipe and it will get a bit louder with stock muffler but i dont know if it will sound nice..

Yes 4.0 is a big engine.. let say you install a flowmaster on a civic.. it will sound like crap.. i used to work right next to a tune up shop where guys installed turbos, nitrous, exhausts, all sorts of goodies on sports cars and they make a civic sound better than z350s and infinities, they also made a 240sx sound like a corvette lol Many people say oh civics normally sound like crap.. well thats only with a ricers can.. if you get a quality catback instlaled it sounds perfect althought people will still say its crap just because its a civic.

Id say anything bellow 3.0 or is not domestic design shouldnt have a flowmaster.. domectic cars are made to take in fuel (same strategy since the 50s) no matter what so they sound good while foreign cars are made to be more economic so many use way different systems than american cars have therefore flowmaster on a japanese sports car sounds like crap. Keep in mind that japanese sports cars have smaller engines (6 is preatty much the biggest engine they use) but they are light as well to make up for it compared to the V8 4k lb corvettes

mrbigjeep 03-28-2007 10:38 AM

i didn't read all that....but lets just say the flowmaster doesn't sound the best on a 4banger....but neither does any other muffler so no definitely sounds good on the 4.0 though

i may be echoing his statements

stevin33 03-28-2007 04:22 PM

other than backflow pressure, does the diameter of the tailpipe affect the sound? for example, would the 50 delta become louder with a 2 1/2" tailpipe opposed to the 2 1/4 or 2 1/8"? and the same goes for the 40...
i checked out the flowmaster website and noticed that there are different inlet/outlet set-ups. which one would fit properly?

Triple88a 03-28-2007 07:30 PM

I will let you know as soon as i install my 2.5 on my delta. I'm preatty sure it will be louder but i dont know if the depth will change.

Bigjeep i used to have a 1.8 Miata before i got a wrangler.. i had a cat back on it with dual tips.. it sounded great actually. It really depends what you like so.. I bet you got the impression that a 4 banger engine sounds horable because most of the 4 bangers are ricers with cheap coke can mufflers you find at autozone or pepboys. When you see a good catback (not just a muffler in the end) you will see what i'm talking about.

Both are 4 bangers
Miata I4 - Goodwin Racing's Roadstersport 2
Miata I4 with ricers can (no catback)

Subaru H4

Triple88a 03-28-2007 07:54 PM

The stock setup on a wrangler is single 2.25" center intlet and single 2.25" side outlet. I know eventually i will replace the catalystic converter and tailpipe with 2.5 so i got a 2.5 intlet and 2.5 outlet and am now just using adapters to make it fit right.

mrbigjeep 03-28-2007 10:34 PM

those aren't flowmasters though are they?...and they still sound like 4bangers ;)

BSing 03-29-2007 01:16 AM

yeah...ill never grow to like the 4banger sound. Unless its an old flat four off a jeep.

stevin33 03-29-2007 09:01 AM

hey bigjeep..
what type/size tailpipe you got on there? that looks sweet...!!
i like the look of the straight pipe out the back.
would i have any problems because i have a hitch?

Triple88a 03-29-2007 10:14 AM

Bigjeep no flowmasters from those videos.. all i was tryign to say is 4 bangers can sound good also.. It just depends what you like..

stevin33 03-29-2007 10:41 AM

so if i were to order a flowmaster with 2 1/2" inlet/ outlet and i wouldn't have a problem with the fitment? even if stock pipes are 2 1/4" from the cat back?
sorry about all the question....
guess i'm a bit anal and would hate to go thru all the bull$hit if i were to order the wrong part.......

mrbigjeep 03-29-2007 10:43 AM


Originally Posted by stevin33 (Post 66666)
hey bigjeep..
what type/size tailpipe you got on there? that looks sweet...!!
i like the look of the straight pipe out the back.
would i have any problems because i have a hitch?

thanks...the tailpipe is stock...only difference is the tip is a 3"...not sure if your hitch would interfere or not

part of the reason i kept the stock pipe was i had heard backpressure issues with larger pipes...

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