Well, there's no way to really tell. The '04 S2k is rated at 240 crank hp and puts out 245 wheel hp. The 350Z is rated at 287 crank hp and puts out 235 wheel hp. So technically the S2k actually gains 5 hp from the crank to the wheels.

There's not much point in trying to extrapolate crank hp numbers from wheel hp numbers, so it's best to just compare wheel hp numbers to each other. Using that method, the '04 S2k has about 10 more peak wheel hp.