How well do our cars compete S/C'd?

[Rally]

**Warning** Stupid question.

Ok I know that with the GTM Stage 2 supercharger the Z makes around 505 whp. My question is with GTM S/C, Bride Low-Max seats, Hotchkiss Sway Bars, forgestar F14's, fast intentions exhaust, test pipes, and oil cooler of course
Something like this set up how do we compare against other cars? On a track, drag, or street how do we compare to a M3, ISF, or S4?
I know this is a horrible thread destined to fail but basically I'm contemplating buying either the Z or a sports/luxury car and want to see how the Z stack up against them when it's been modded pretty heavily.