I just had my 07 550 dyno-ed. It pulled 255 hp. This seemed low so we got another used 550 out of the dealer's lot and it pulled 278 hp. With 360 hp at the engine I should be at 280 minimium and certainly not 20+ hp down from a similar car tested in identical conditions. I am trying to find who stole my horsepower and what I need to do to find it. Has anyone else had a similar situation?