i put down 580 hp/ 540tq, and made 1 lb less boost--about 17.5
this was with 17.5 degrees timing. i'm guessing the humidity caused the lb of boost loss, so maybe there's just a bit more hp with better air. the week prior, we had bone-dry, 60 degree weather, and the car put down 590 at 18 degrees, and 615 at 20 degrees with a bit leaner tune--with 18.4 psi.
either way, i was very pleased to get 2 tunes saved in the car. the first one has about 15.5 degrees timing and made 560hp, and the second tune (which is currently programmed into the car) is the 17.5 degree tune, with 11.5 a/f.
hopefully the GTO will make 380ish once i get it tuned--i don't really know what to expect from it. i probably should have done longtubes instead of a catback.
once i get some time, i'll have my brother come over and help me get the video of my last pull--it might be a week or so though, but i will post it.