Stock is y-pipe, if you get x-pipe it wont fit. From what I understand, a well-designed x-pipe creates a current in the exhaust that suck the exhaust air out of the back. As for y-pipe, you can connect a single back exhaust which is the most lightweight and track-proven design. That is why my ideal catback is y-pipe with amuse r1000 single catback. Check Travisjb's exhaust
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