RCC or Velocity. Stick with 4lbs of boost or LESS on an 08. If you feel like pulling out the Ti valves and installing stainless, good valve springs and a base spacer(I think they are using .090s on the 08s) you can run more boost....probably 8-9lbs on pump gas.
Personally, I think on the 08 busas, the money is better spent on a good pipe, cams and a custom map..... That will get you 190hp reliably. If you want more, you could put the 3 mil pistons in it(1441cc), port the head with the custom cams, this will get you 230hp....same power as a turbo(4lbs) but much more reliable and probably around the same cost. Bolt on and forget it...unlike turbos..