Hey, I am new to the board...So far I have installed phenolic spacers (keep intake temp. lower than stock), magnecore wires, iridium sparks, and the sl55 amg air splitter kit. I drove the vehicle like new for about a week or so...I figured I would let the ECU figure out the add-ons. I will tell you this thing kicks faster toward redline, idles better, gas mileage a little better, anyways I was doing roll-ons with a friend and we are no longer even!