If a GTP ran 15.1 then it was either driver error (insert Serenity GTP here)or the car needed love. My GTP ran 14.9x bone stock...down to the paper filter and u-bend still in it.
Intake, 3" DP...180* on a cold day with a 3.5" went 14.26 around 96-97...
1.84 Roller Rockers, 160*, colder plugs...and all that crap that means nothing...netted 99-100 mph trap speeds running 13.8-13.9...still no tune...car probably would have gone mid 13's tuned.
I don't even want to know how slow my silver car runs...and obviously it got pooped on a basically stock GTP (intake, tune...etc)
See destruction, here: http://www.grandprixforums.net/real-...ace-56685.html
Granted, anything is better than stock...but by today's standards...hell, even 12 second quarter miles are becoming common. Back in the mid to late 90's...mid 14's for a family sedan was pretty quick.