I think SR20 even with a single turbo, it's too light to keep the car from lifting while going over 100mph. I know even with L6, the stock z without the from airdam and lowering spring the car lift like hell on the interstate about 100-120mph. In contrast, the light SR20 powered would be a great handling car like RX-7. The SR20 is a great motor, but I think it's more suited for a smaller car. IMO. Also, since the SR is sleeved alunium block, would it not hold as much boost as RB with an iron block? Is the SR20 non turbo block high ductile iron sleeve block? If you want a accessible 4 banger why not KA24 with some boost? How about the torque output of SR20DET? Sorry, I'm in kind of skeptic mood.