Which mod did you notice the most in your truck performance wise?
6637 ?
turboback exhaust ?
hutch/harpoon ?
frx?
hpx?
tuner?
injectors?
turbo?

 

Well....most noticeable difference was the tuner. Now that being said I did gauges, exhaust and intake before even considering the tuner. Some are saying that the exhaust is unnecessary unless adding bigger injectors and such.

Tuners will have the most effect and a must have if doing anything more than stock injectors.

All the things you listed play a roll in increasing performance and some of them need to be done in a certain order.

I'm at the point now where I'm out of options unless I change injectors. The last thing we are doing is adding bellowed up pipes and changing my exhaust housing on the turbo this weekend, I'm getting a ridiculous amount of surge.....

 

I would have to say the tuner makes most difference. However, the only other thing on that list that I have is an FRx.

 

Injectors, but they weren't first. I wanted most of the others as supprting mods before deciding on which injectors. I got gauges, VB, exhaust, CCK, HPOP, tuning, MAP fooler, and upgaded intake & turbo before injectors and then live tuning after the injectors. Oh yeah, the first mod I did was the Hutch/Harpoon.

 

i have frx, hpx,hutch/harpoon and 6637 it runs nice but performance wise i dont see big difference. my buddy has none of it but guages and bully dog or superchips tuner (cant remember) and his truck off line in race was only one truck lenght infront of me til 70 mph then shut her down