My guess would be around 250-300 HP should be a pretty safe number,Not to sure as i have a 02 bugeye that does not make the kind of power the "Newer" model makes.Right now i have a Cobb intake,Sti V7 Upipe,HKS Downpipe,Tanabe exhuast,Cobb AP Stage 2 OTS map boost is @16psi Claimed 280HP.Stage 2 really wakes up the car and feels pretty solid im sure the numbers would be better for you than me and will keep you happy without any issues.