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What's The Best Diameter For the Exhaust

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Old Feb 24, 2009 | 12:19 PM
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RaboXJ
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From: M.I.A.
Year: 2000
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Engine: 4.0L
Default What's The Best Diameter For the Exhaust
I going to make a non cat, and non resonator exhaust. I'm just putting muffler and was wondering what's the best size piping for the 4.0L
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Old Feb 24, 2009 | 12:25 PM
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From: Gloucester Virginia
Year: 2001
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Id say 2.5. Anything bigger then that and you will prob suffer powerloss. It also sounds great and has enough backpressure for the engine.
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Old Feb 24, 2009 | 12:25 PM
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I think we beat this to death in another thread
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Old Feb 24, 2009 | 12:26 PM
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https://www.cherokeeforum.com/f2/does-exhaust-get-louder-bigger-pipe-10825/
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Old Feb 24, 2009 | 12:27 PM
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BuckB91XJ
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From: Oak Harbor, WA.
Year: 1987
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Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator
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Defintiely 2.5". Been working great on my XJ 4.0 HO.
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Old Feb 24, 2009 | 04:17 PM
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Originally Posted by BuckB91XJ
Defintiely 2.5". Been working great on my XJ 4.0 HO.

X2.....

......
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Old Feb 24, 2009 | 04:18 PM
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Year: 1992, 2- 1998 (All 3, 4 Doors)
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I'd agree w/ the 2.5"... 2.25" isn't bad either...
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Old Feb 24, 2009 | 05:32 PM
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2.5 is the best size for the 4.0 any bigger you will lose torque unless you turbo or supercharge there is no need for larger
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Old Feb 24, 2009 | 05:35 PM
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Lets say I stroke the engine to 4.9L would it still be the same size?
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