From my searching, I've noticed the the information of DIY tuning or tuning software/programers is limited.
I have found a group that appears to specialize in GM ECMs for an array of vehicles: Sinister Performance, LLC
Does anybody here have any experience with those guys? I rebuilt my 2.5 and I'm looking for a way to tune the car with the little modifying I've done. The advanced tuning option thing of theirs seems rather attractive.
If not this, does anybody else know of a DIY tuner or reputable tuner that I could use to get mine tuned?
[This message has been edited by PRND3L (edited 01-26-2015).]