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i have a VMP tune, 2.50 pulley and 80mm idler my 2012 gt500, so it was ok until i did a track day and now when i punch it the car kinda hesitates ( really jerky) or stumbles then takes off normally, if i slowly apply the throttle it seems ok. the boost gauge acts normal but i know that thing is...

I ran 32psi last time and the edges of the tires are almost bald, anyone run different PSI on the stock tires?

do you guys offer the 2.5 pulley instead of the 2.59 with your upgrade kit? and is there any slipping since the idler is the same size as the 2.59 pulley?

I went to pacific raceways for a ride and drive and once i hit 4th gear from 4000-to 6000 rpm it was like 5th was missing or it was grinding. has this happened to anyone, if so how did the stealership fix it? Its a 2012 GT500 SVTPP thanks