no he has about 20k on the stage 2 and never had a problem with it. throttle body is nice and clean. car has almost 50k on it now. he did have a problem however when he had an intake on it that it rubbed a hole in the piping. but thats it. reinstalled the stock intake and never had a problem out of it. also another thing i just thought of about the idle surge. make sure the vaccum hose for the boost regulator in plugged in. by taking it off you increase boost a couple of lbs. good only for running at the track. NOT for everyday driving. I have seen by leaving the hose off it can cause the car to surge.