Looks like the AMS GT-37R turbo. You'll see full boost by 4,000 give or take 100 rpms I have estimated. ( I tested my results againest my professor here at school, I am a Aerospace Engineering student). I said it would flow to 8125 rmp's.This is a bad ass street turbo making good power! I personnally would like a GT-40R but i keep thinking on picking up this turbo.