Ok a S14 Blacktop is almost exactly the same as the S15 blacktop besides the 6-speed transmission, larger injectors, and extremly minor diffrence of the turbine wheel and the divider on the exhaust side. So why is the S14 blacktop rated at 220 and the S15 at 250? Is it just set at a higher boost than the S14? Or do the injectors pull out an extra 30hp? Flame away I dont care just as long as you answer my question please. Thanks.