Exhaust systms - JeepForum.com

 
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post #1 of 6 Old 01-31-2012, 10:33 PM Thread Starter
lvngtheJEEPlife
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Exhaust systms

I have a 94 ZJ with the 4.0, i strapped on a magna flow muffler on a eliminated the Cat, but i left the stock pipes. Will this hurt my performance? The stock pipes are really small, so is the new muffler doing nothing because of too small of pipes? thanks!

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post #2 of 6 Old 01-31-2012, 10:48 PM
stormer1092
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I'm no performance pro but a more flowing pipe is more than likely helping same with eliminating the cat and replacing it with a test pipe. I heard somewhere someone correct me if i'm wrong but a 2-3/4 pipe is the best size for the 4.0. I believe stock is 2-1/4.
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post #3 of 6 Old 01-31-2012, 10:59 PM
zander21510
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...btw eliminating the cat is illegal by federal law...I see closure ahead!

Anyways, from what I've read you need a little bit of backpressure on the 4.0 to have it reach its full potential...but keep in mind it just wasn't meant to go fast lol. They make hi-flow cat's and mufflers.

PM Kolak, he's the man to talk to with exhaust.
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post #4 of 6 Old 01-31-2012, 11:05 PM
stormer1092
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Quote:
Originally Posted by zander21510 View Post
...btw eliminating the cat is illegal by federal law...I see closure ahead!

Anyways, from what I've read you need a little bit of backpressure on the 4.0 to have it reach its full potential...but keep in mind it just wasn't meant to go fast lol. They make hi-flow cat's and mufflers.

PM Kolak, he's the man to talk to with exhaust.
hey now he installed a test pipe.
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post #5 of 6 Old 02-01-2012, 02:53 AM
Buzz98zj
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Can't believe this wasn't shut down yet. Lol we don't discuss emissions here.

98 5.9
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post #6 of 6 Old 02-01-2012, 05:30 AM
ratmonkey
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put a cat back on it. no performance gain from it being gone, it's illegal, it's bad for the planet.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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exhaust , exhaust system , muffler replacement , performance improvements

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