tire psi question (goin to the track)

well im goin the to the track for the first time next wed. im going up there to put another stang to shame (again) because i burned him pretty bad the other nite when i raced him he said he was beatin on 99-04 gts all nite a friend called me and told me this for his car with his mods i didn't even think he had a chance (1996 GT upper intake manifold, pulies, catback, chip) went from about 0-80 and had 3 cars on him so i shut down, he insists that i must have more done to my car than mufflers and tires. ive been wanting to go to the track for awhile now, this just gives me a reason to go so why not?

the question is what should i lower my rear tires too? they are 315/35/17 BFGoodrich g-force T/A KD's....

will i be able to launch at a higher rpm because of this? i can currently luanch at 1500rpms dropping the clutch w/o any wheel spin
 
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