If you want a fast car the Zeds not the car to own ...... If you want your zed to be a fast car then a supercharger is the way to go , usable /drivable power . ...... But by the Time you've done this you could buy a porker , but not everyone wants a bm/ por/ audi .
Can't really see a massive difference in running costs between the zed and other sports car IMO
This is until the Porsche goes wrong and you have no warranty !!