My CEL light likes to come on and off whenever it feels since I got my downpipe. I installed my pipe and about 2 days later it came on, then went out another 2 days later. Then again 3 days later, it came on again. I believe the CEL light comes on depending on how you drive. Drive slow, shift below boost, and save gas for a day, it'll go off. Drive hard, hit boost alot, and it'll come on after a while. It all depends on how much nasty nature-killing shyt is coming out of the exhaust I guess. Has anyone else had the same CEL ghosting, or is there possibly something else wrong with my car?