like it says, put a grimmspeed manual boost controler on the wastegate and the boost source coming off the pipe in the very very back. took the t out and put cut the boost source hose and put the t in to like normal. everything was fine. didn't even raise boost since i have no boost gauge. then i put a cone filter in stock intake. drove it for like 50 or 60 miles and then the SERVICE ENGINE SOON light came on. Why did it do that? and how to i get it gone? if i reset the ecu i know it will help for a minute but then will it go on again? how do i get rid of this damn thing?