Got the SCT tuner from hemifever programmed in my truck today with the can tune. Its tuned with the cheapest gas now because that's what was in my tank. I'm completely happy with it! My question is there a noticeable difference in performance with the higher grade fuel then the lower? I'm to impatient to find out on my own. Without the tune there wasn't much of a difference

 

93 is a huge diffrnce , i pinged though and switched to autolights 3923 and used a 180 t-stat and it stopped

 

If you ping any, you can also talk to Sean (hemifever) and get him to scale you back a little. He's really good like that.

 

Man! I really want to get one of these from Hemifever, but I need to do a tune-up first. I would also want to put a CAI on and replace my stock exhaust with an aftermarket. My question is, should I get the tuner the make the beast breathe or do it all and then get the tuner?

 

If I were you I would get the tune up and plenum before the tuner and the CAI and exhaust after. There are probably other thoughts on it though because its kind of a personal preference thing.