This is going to be my first post on this forum, I've owned my 2015 Q50 for about 10 months. The only aftermarket things I've really done to it are exterior things, rear diffuser, small carbon fiber spoiler, black rims ,painted calipers and also of course 20% tint. I started doing a little more research about the exhaust from hearing about how restrictive the stock exhaust is and decided to buy the Megan Racing resonated test pipes. I've got a cheap OBII scanner and I've read about the CEL coming on after installing this for various reasons. But my question is, can I wipe the code when it appears, as long as its nothing serious like an exhaust leak or something? Because alot of people are saying a tune is required when getting testpipes and im also confused there because I thought getting a tune was only really used for HP and TQ gains.