dont forget to figure in the tq managements and throttle position sensors on the s197. a buddy of mine who owns a 06 said that once he got a programmer for the car and got rid of the tq management that it was like whole different car to drive. when you mash the gas on a stock 05 the tq managment kicks in and doesnt allow the throttle body to open as quick as you think. its not a cable connected TB. its by wire. just thought that i would throw that out there.