I have 4.57 on mine, I'm only pushing 313whp and first doesn't even exist lol. I wouldn't recommend 4.57 with any boosted AP2, I've had this gearing since I was all motor though... So yeah. I'm probably going back to stock eventually.

 

I'm at 4.45 form the carbonetic unit. It was whim of curiosity. It'll spin through the top of third: AP1, vortech Si upgrade at 18 psi.