can you post without insulting me? i can can google it but i also don’t believe everything thats on the web. i think i know a lil more about turbo buicks than you. based soley on what you described its not possible. a stock GN motor in a stock weight GTP isn’t goin 10’s or 9’s.
you would have to put bolt ons (turbo, ic, injectors,etc) to produce those times. its possible with stock internals and those bolt ons to crack the high 10’s but even to get a GTP in the low 10’s you would need to beef up internals on a Lc2. I’m sayin… the only way to do what you described, the GTP would have to weight like 2000lbs or less.
all i found was a video on youtube of a 9 sec gtp with a turbo’ed 3.8… thats not a GN motor. sure the 3.8 is a buick block buts its not the same as an 87 GN.