I think it all depends on the track you race at on, if there are alot of straights then the boxter (not even going to call it a porsche) may have the edge as it will take advantage of its top end better, but on corners and lower end torque I think the Z will pull it back. I definatly wouldnt buy a Boxster S over a Z though, as the Z looks far better. Now Baptists car, thats a different story, got to say Im even liking it more than Sarnies and thats shocked me as I love lambos