Once again, I will say that the Legend twin turbo engine (as found in 502) is not just a bolt on kit to the stock PRV-V6. Most if not ALL of the engine internals have been changed. Considering the fact that there are French sportscars ("Venturi") that use the Bi-Turbo PRV-V6 engine that have 450HP from the factory, I don't think 300HP is so hard to believe. Marc