Hah! I know the feeling, I have a twinturbo 300zx, gutted cats, turbo turned up to 14psi, intake and exhaust systems... there is NO RATIONAL need for this car, but I'll be damned if that is reason enough to have the government tell me I can't have it. Hey, I dislike most SUVs (drivers actually) on the road, but I am not about to tell them they can't drive em.
Why? It should be good sport to pass them on the winding roads with your Z!