I'm not sure what my car is making for power at the moment but i'm betting around 300-310 whp, the injectors are at about 80% DC so that is just about as far as you want to go. I have the 255 pump already. The reason i'm going with the 1000 cc units is i will be tunning it on E85. It takes about 30-40% more fuel to make the same power as gas.