research mr turbo and hayabusa kits, more info probably on the other busa site. They are bottom of the barrel, and there are a lot of turbo kit manufacturer's out there for busa.
at $1,500 i would pass on a mr turbo if it were me, now a hahn kit for $2000 or so wouldn't be bad, but still RCC is as good as it gets for support, quality parts, support, bang for the buck, and did I mention support?