Take a look at Z1 Motorsport's 400hp kit (flywheel hp) if you're gonna stay N/A...otherwise look at the boosted kit's available.
Twin Turbo easily puts down 600rwhp & a single supercharger w/air cooler 500rwhp....it's all about the ($) & where you are looking to go.
without boost or nitrous; peak is around 340ish rwhp.
Also,,,Mods are like drugs....very addicting!
have a good day