Homebrew Jeep Mods
#586
Beyond improving over the stock air-filter, unless you've upgraded the exhaust, ported the head/intake manifold or have a stroker doing other upgrades won't necessarily make much if any difference in performance.
#587
Junior Member
Join Date: Oct 2010
Location: muskegon
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Year: 1994
Model: Cherokee
Engine: inline 6 4.0 H.O
Well the exhaust is 2.5 inches from the cat back. I would love to stroke it out, but I don't have the money or the ability to right now.
#589
Seasoned Member
#591
Seasoned Member
#592
Seeing as airboxes are cheap and plentiful, go for it.
#593
Seasoned Member
#594
CF Veteran
Join Date: Jul 2009
Location: New Jersey (Milltown, Lavallette, and Wayne)
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Year: 1999
Model: Cherokee
Engine: 4.0L I6
Originally Posted by bikerider
That's not true at all. The stock exhaust manifold is actually pretty well designed as far as flow is concerned.
does have a kink or dent in it for no reason. Nobody had been able to figure out why it's there but we do know it restricts the flow.
#595
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Join Date: Dec 2010
Location: Blue Ridge,va
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Year: 86
Model: Cherokee
Engine: 2.5 TBI
gonna start parts collecting this week!
#596
the type of exhaust that flows the best will have the cylinders paired up by 180 degrees in crank timing to help match-up exhaust pulses and for low-reving engines like the AMC 242 the tubes would be nice and long to help out the torque band.
Incase you haven't noticed, the stock manifolds do neither
#598
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Join Date: Dec 2009
Location: Fontana, CA.
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Year: 1990/2001
Model: Cherokee
Engine: 4.0
That kink is there to make room for the drive shaft as it cycles thru the suspension travel. When I first got my XJ I didnt notice any interference until I installed my lift.