I think the 55 kompressor wil fit under the stock hood but not absolutely sure. Someone needs to take some measurments of the engine to make sure and compare to the measurments of a n/a engine. It might be more cost effective to turbo a n/a V8. I have done the math and it looks like a turbo will put me around 480 which is real close to the 55K and if I lower the compression and raise the boost to 13 - 15lbs it would be a little over 600HP which is right there with the SLR engine (and that is before nitrous ). There is no replacement for dispacement!