The only aftermarket performance parts i have put in my 05 renegade are the flowmaster super 44 muffler and fitch fuel catalyst, im planing on put in a k&n cold air intake with a fastman throttle body spacer i also want to get a performance chip, i have searched the forum and all the threads are about the CRD or KK's. Which is the best performance chip for a 05 renegade?

Performance chip? none of them, if you want may do a computer reflash but the chips are worthless really. The computer relearns around them in no time
The K&N cold air is a worthless investment as well
the stock box with a good paper filter does as good or better than any of the hot air suckers so save your money.
Fitch fuel catalyst =snake oil

_________________
MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Unless your willing to spend thousands on internal engine work that computer mod is worthless besides correcting the speedo.All those that will come and say this and that may see gains but in truth all they are doing is reducing engine life and cat life from running to lean.

The only proven performance mods on a gas KJ is to regear to 4.10's.

Thanks for the input. If the FFC is snake oil does it do any actual harm to my jeep? and is there any computer reflash you'd recommend?
As for performance enhancing after parts is there anything you'd recommend aswell? (under $600)

If you are dead set on getting a tuner, I believe the only one that reflashes the computer is this one(as Tom said, so the computer doesn't relearn around it.) All the other ones are worthless. The Grand Cherokee crowd seems to have favorable reviews on this tuner with the 3.7 engine.
http://www.hypertech.com

If you do end up getting the tuner, post a review and let us know how it works!

_________________
2003 Jeep Liberty Freedom Edition
3.7L 5 speed manual
OME 927/948 w/Bilsteins
245/75/16 Goodyear Duratracs