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post #1 of 6 Old 08-09-2010, 09:01 AM Thread Starter
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2001 TJ Wrangler 
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Exhaust mods?

Ive got a banks Monster Exhaust cat back on my 4.0L TJ right now. Sounds really good and I like it, but I want to add some more to the exhaust. I was thinking about a header and a hi-flow cat. Woud these mods get the extra sound Im looking for and possibly performance? Are there any other exhaust mods you guys can suggest? Ive heard that headers can rob the engine of its low end power, but maybe thats just a myth.

Any help on this would be appreciated.

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post #2 of 6 Old 08-09-2010, 09:05 AM
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i chopped my banks and downturned it right after the muffler. It definatly gave it a louder/throatier sound. less pipe=more flow

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post #3 of 6 Old 08-09-2010, 09:09 AM
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Performance? I doubt it. The basic word on the 4.0L is that you're not going to get much more power out of it unless you're increasing displacement. The header might give you a little, but the converter is fine in stock trim.

The sound might change a little. I think you'll do more with a muffler change, though.

If it's worth doing, then it's worth overdoing.

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post #4 of 6 Old 08-09-2010, 09:26 AM
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Tubular header will give you a bit more of an aggressive sound. Not much louder, but more defined and muscle-y sounding.
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post #5 of 6 Old 08-09-2010, 09:51 AM
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Don't waste your money.The muffler is the best way to change the sound.Nothing will help the performance to any degree.

Originally Posted by mrblaine View Post
If you can tolerate the Bilsteins, that will invalidate any discussion you and I may have from now on.They are real handy at determining if a quarter is heads or tails simply by passing a tire over it.
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post #6 of 6 Old 08-09-2010, 05:22 PM
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You already have the best exhaust manafold you can get, the OEM one. Leave it alone...
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header , hi-flow , cat , exhaust , banks , monster , tj , wrangler

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