I was talking to a Pontiac guy last night. I believe he said he was a member here. https://forums.maxperformanceinc.com/forums/ I'll ask him again and report back.
Performance Years was merged/bought out by Ames Pontiac about 4 years ago . The Performance Years board was moved to the 'Max Performance' site mentioned in post #2. It's a fantastic board for tech info.... much of the GTO stuff also applies to our GS's.