Jeep 4.0 Performance Mods (What Actually Adds Horsepower?)

[HarleyMick]

Since I don't know what I'm doing, I'm posting pics separately

 

[That one clean jeep]

considering you have a dyno and i do not, my comment clearly must be taken with a grain of salt. My 2002 4.0 absolutely saw gains with the K&N cold air and hypertech programming. when programmed to run on high test it will also lift the front wheels off the ground - only a little. I also have 35's with 4.10s, a banks cat back and throttle body spacer, which i dont think does anything outside of making a whistle. but the first 2 were absolute power jumps to the engine.

I have a 03 with 4.0 and 5 speed what all can I do to get some more power out of it?

 

[RockyTopTJ]

I have a 03 with 4.0 and 5 speed what all can I do to get some more power out of it?

Stroker, Forced Induction, both, or motor swap

 

[lBasket]

I have a 03 with 4.0 and 5 speed what all can I do to get some more power out of it?

If you put really tiny tires on it it might feel more powerful

 

[Blake Stamper]

I have a 03 with 4.0 and 5 speed what all can I do to get some more power out of it?

Buy a Jeep with a 2.5 put it on 35s, drive it for a year, when you go back to your 03 with the 4.0 and 5 speed it’ll feel like a racecar

 

[ranger101]

I have a 03 with 4.0 and 5 speed what all can I do to get some more power out of it?

Gears