Never mind asking myself why its not been done. Ask any mod company have they tried this and im sure i know the answer. And ask them have they ever fitted a tial wastegate system to a stock twin turbo supra. And as for being mehanically minded no i aint....Do you need to be to upgrade your car, not like im doing it ???? This guy is willing to carry on the maintenance and tuning of this car so why the heck would we lie. We know what weve done. The figure 500BHP comes from racing other 500 bhp cars and comfortably winning on a the basic program with the car running at 1.1/1.2 bar boost. It can be turned up to 650 BHP whether people like or not. tell a 650bhp owner or there abouts to come and see andi will prove this