Cat-backs - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

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post #1 of (permalink) Old 02-10-2001, 01:11 PM
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My YJ is going to be needing a new muffler and tailpipe soon. Was wondering what experiences everybody had with the various cat-back systems that are on the market (Borla etc....). Are they worth the money, do they add performance like the claims, etc.

Thanks Ed
89 YJ 4.2 auto

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post #2 of (permalink) Old 02-10-2001, 07:37 PM
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Re: Cat-backs

I bought one to go on my 94 YJ. Didn't think to check out what was on the Jeep before I bought the cat back in relationship to stock. Anyway, I still had to go to the muffler shop as the exhaust system had been modified by the previous owner and would not just bolt on.

Good Luck!

post #3 of (permalink) Old 02-11-2001, 08:42 PM
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Re: Cat-backs

I installed Borla cat-backs on my 90 4.2 and my 95 2.5. It seemed to help the highway performance of the 2.5, but I didn't notice much difference on the 4.2. I think it's because the 4.2 has a 2" factory exhaust pipe and cat, on the 2.5 they are 2.25", allowing the 2.5 to take better advantage of the lower restriction of the Borla. After instaling the Borla on the 4.2, highway mpg is 18, I don't know what it was before.

I had to some modifing to get the large exhaust tip to clear the hitch on the 95. And since the inlet on the Borla muffler is 2.25", I had to buy an adapter for the 4.2's 2" exhaust. I paid $200 each for mine when had 1/3 off, and I think they were worth $200.

Before you buy anything, try searching the archives. A lot of people seem to like Flowmaster mufflers and they are a lot less expensive than Borlas.


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