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Unread 08-09-2010, 09:01 AM   #1
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2001 TJ Wrangler 
Join Date: Jan 2010
Location: Ontario,Canada
Posts: 111
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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Unread 08-09-2010, 09:05 AM   #2
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2004 TJ Wrangler 
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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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Unread 08-09-2010, 09:09 AM   #3
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2003 TJ Wrangler 
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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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Unread 08-09-2010, 09:26 AM   #4
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1998 TJ Wrangler 
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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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Unread 08-09-2010, 09:51 AM   #5
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1998 TJ Wrangler 
Join Date: Aug 2006
Location: Charlottesville, Va
Posts: 28,663
Don't waste your money.The muffler is the best way to change the sound.Nothing will help the performance to any degree.
When I had 3.07s I would draft behind birds as an attempt to do the speed limit.

2000' WJ Limited 4.7L-V8/D44/Quadra-Drive/31" MT's/3" lift
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Unread 08-09-2010, 05:22 PM   #6
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2000 TJ Wrangler 
Join Date: Aug 2005
Location: Colorado
Posts: 16,489
You already have the best exhaust manafold you can get, the OEM one. Leave it alone...
TSB Information: http://www.automd.com/tsb/jeep_m/wrangler_mm/2000_y/
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header , hi-flow , cat , exhaust , banks , monster , tj , wrangler

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