MM&FF just showcased an 05 with a KB getting 459rwhp and even hitting 535rwhp with the 2.4
They had to swap out to a sturdier clutch for the latter apparently.
My only question is, what hp is that car's safety limit at in terms of what it can handle before you're looking at a likely rod/piston blowup?
Seems that those numbers are high for the GT. (at least for me, I'd wanna stay safely within the car's limits. Buying a new engine isn't something I wanna do just yet).