Jozsefsz, I'm basing it on at least a dozen, probably more like 30, negative reviews from On3's customers I've read over the years. I've been involved with the turbo community since back in '04 when I had an incon kit. I frequented theturboforms back when they were still turbomustangs.com. I remember how poor the kits were back then. Even if they've improved over the years, it's clear that they still sell really shoddy stuff. Reputation is important, and On3's reputation is some pleased customers and a ton of guys who regret having done business with them. The kits have the worst reputation of any turbo kits I've ever heard of. I'd love to save the money, but I'd rather pay $2k more and be happy the first time with parts that will last for a long time. Plus, I'd be kind of embarrassed to tell someone that I did business with such a questionable company.