2004-2007 Cadillac CTS-V General Discussion Discussion, M.P. CTS/V on Ebay = 17% drivetrain loss in Cadillac CTS-V Series Forum - 2004 - 2007; At least by my calculations.
625 hp, 524 rwhp
Seems right in there with the dynos of the 400hp ...
Actually gents, they probably took the 17% from their dyno run of a stock V compared to 400hp, and then raised their RWHP on the supercharged car by a similar ratio to ESTIMATE engine HP. Simple, no? Nothing is proven, nor disproven.