I purchased a 2006 GTO M6 a couple weeks ago. From what I gathered from the previous owner through the dealer I bought it from, it has the following mods:
Texas Speed Torquer V2 Cam
Texas Speed Pushrods and Double Valve Springs and Retainers
ARP Head Bolts
X Air OTR Intake
Unknown brand of LT Headers, has welded on plate with name but it is up against a part of the engine bay where you can see there is a name plate there but can't see the actual name.
SLP Loudmouth V2 Exhaust
Solid Motor Mounts
I drove it 4.5 hours back home, mostly interstate, and had no issues and got a nice almost 23mpg. The next day after sitting in some construction traffic for a good bit of time, check engine light came on. Was a P0507 code. I cleared the code the next morning and it came back on in the afternoon. It seems to run good and strong, but am trying to figure it out. As far as I've checked, no vacuum leak issues that I know of. I replaced some PCV hoses that were cracked, then cleared the DTC again and later in the afternoon it came back on. If someone can look over this tune, as the only info of who tuned it was someone probably close to the Jacksonville, FL area as that's where the car has been most of it's life. Let me know if anything stands out in the tune as to what could be causing the DTC or if there is anything else of concern. Thanks!