I think there is/was a member that posted a faq about a cheap way to install gt28R turbos. Try searching HakenTT. or looking through faqs for the write up. Otherwise I would say Z1 GT600R. However Z1 is coming out with a 530BB type turbo that should be a better price point than the JWT and a more complete setup as well. Either way to get 500hp you will have to run more than 91 octane. Hope that helps.