Considering the parts that are now available for the Dseries motors you can make one twice as fast for MUCH MUCH less than you could swapping and then adding parts.

Sleeper is right on all points. We both have the experience and the knowledge to claim what he has said. I still get about 28 mpg on 93 octane fuel and run a 12.6. h:

I don't think you realize that with the correct tuning you can drive daily without effecting your regular mpg. You could run 30 psi and still get great gas mileage. Of course, if you're boosting all the time and pushing the motor to the edge constantly, you will get horrible gas mileage. That could be said about even a stock motor.

Listen to Sleeper, he knows what he's talking about.