440-450rwhp with 360-370lb/ft tq is fine for the standard engine. Rebuilding the engine is costly and complicated, unless you want to go for a crazy fast 900rwhp there is no point wasting your money.
Just get the supporting mods - oil cooler, better injectors, better fuel pump and spend the money on suspension, brakes and tyres
Nevermind comments from people sending you to rebuild the engine, they don't have SC cars, listen to evilscorp and SamMcGoo, we all have / had SC zed
Not that's what I call being arrogant :lol: