Costs twice as much, but is so much more fun. My oppinion is if you do a large turbo upgrade your wasting your money if you plan to run pump gas. I could have saved a lot and had far less lag if I just went with sport 500s. I decided long ago I wanted a 500 RWHP car I could daily drive. So short of buying a Lamborghini Murci I went all out on my z.