Thanks for the reply. What kind of gains can be expected on a bone stock '12 gt m6?
Well from the testing we've done your looking at a 18-20rwhp peak gain and as much as 30rwhp gain from 3500-4500. Through out the curve your looking at about a 10hp gain on average.
Would I gain any rwhp or performance gains versus the procal tune that I have on the car now?
Canned tune vs Canned tune - Probably not enough to justify the cost.
Procal Canned Tune vs Custom tune - You'll probably notice a bit of increased performance.