I did mine a couple of weeks ago, and my pedal no longer sticks when I step on it. I used the Penzoil(how ever you spell that) throtle body cleaner. I used the whole can like it said in the directions. I did blow a bunch of crap through my pipes which is good. Performance wise I really don't think there is a huge difference. Maybe with all that crap is comming out the back it might help a little. I didn't notice a huge difference.