Does anone know what the best psi it is to run at the 1/4 mile track on factory STi BBS 17" with the stock 070 bridgstone tires?

Run as much as the tires allow, maybe 50 PSI. This has the advantage of reducing rolling resistance as well as giving you a better chance of slightly spinning the tires at launch, rather than spinning the clutch, etc.

G

uhhh, i disagree, if i air that up my tires that much I can completely smoke them, i have to lower mine to 20psi ish to even get good traction for a nice hard launch

-Z

Good grip in second gear 278whp
http://img.photobucket.com/albums/v241/BriarRabbit/2ndgear.jpg