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1999 WJ Performance Mods?

7K views 14 replies 7 participants last post by  FlyinRyan 
#1 ·
So the list of things that I could do to improve HorsePower on my I6 4.0L.

The things I have so far:
- Flowmaster 50 Series Muffler
- K&N Cold Air Intake 57 Gen II.


Need to get:
- Superchip Flashpaq Tuner
- Throttle Body Spacer (does it improve anything?)

What else?
Electric fan conversion?
MAP adjuster?
Larger injectors?
Ported big valve head?

Suggestions?
 
#11 · (Edited)
Well for some reason Scott it gave us a completely different website, atleast for me.

Edit: You posted this: http://www.hesco.com/

As for 4.0 performance I think member named Budakane might be able to help us. I recall he has a blown 4.0
 
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