Not sure you would need it. I suppose it depends on which year and which engine, but I have heard of racing versions of the Seven with dual turbos.( I think the output was 250 hp) I mean really, the 230 hp Cat version is said to 0-60 in 3.4 and 0-100 in 8.1. With the car weighing all but 1500 pounds, you really don't need a lot of muscle. That and adding a different engine will throw the balance off I would think. However, I have no idea how difficult it is to drop 2 turbos on.
Sean