I have them on mine...couldn't tell ya if it made a difference though, since I installed them while I was waiting for my ECU to come back from Renntech with the pulleys...I did all the mods at once.
They are nice wires though...I decided to get them when I was reading MB forums...someone there got a 3 mph gain in the 1/4 mile from them and the Denso plugs...so I figured what the hell and bought them.