1: Have an 07 FX4 SCREW 5.4l. Replaced my stock muffler( only changed muffler and added a piece of pipe) with a flowmaster. Changed out my stock air intake with a Saleen CAI (uses the stock airbox and only relocated the intake tube behind the left headlight). Should I retune the motor?
2: Anyone ever use a Jett performance chip and is it worth the money?

Thanks

 

You do not have to get a tune for those mods, but a tune helps. Only thing worth the money is custom tunes. SCT tuners with custom tunes from More Power Tuning, 5 star tuning, and some others I cannot remember are the way to go.

 

Thanks for the info. I'll look into them.

 

sct sf3 from any of the forum sponsers plus custom tunes