Originally Posted by Maestrob4u
Thank you so much for that. So I'm guessing a GM LSA (Cadillac CTS-V engine) or a BMW S85 would be a much better idea?
Going to anything other than a BMW motor would be substantially harder due to the incompatibility of the electronics. My personal choice would probably be a tuned S65, not supercharged (to keep the weight down), maybe stroker or built with cams and a 9k redline. Any heavier motor, including the S85, would adversely effect handling.
But as long as you're dreaming, you might as well use the S70/2 V12 that BMW developed for the McLaren F1. 680+ hp @ 7800 rpm in LM trim.