I am not certain but I think that there were some issues with the quality of the boost unlimited (stedmans kit) and that is why themotorhead didn't go that route on the newer ghetto kits. For the price, you can get the ghetto kit from themotorhead. It is a proven 270 HP with good future upgrade capability.
Try him, you won't regret it:
THEMOTORHEAD@AOL.COM