i had a gibson muffler already ordered. didnt have the x design. jegs sent me everything at once but not the muffler its not in production or available anywhere either so instead of returning the xpipe i just put it in. yes the borla has internal x design. wich i didnt kno wen i bought it. so i essentially have the exhaust xd over twice . the clip sounds deeper toned than it is because the cam is on the ground. i dont get any pop or crackle just smooth tone its actually quiet at idle and fairly quiet at cruise up to about 40 mph just loud enuff too hear inside the cab wich is what i wanted. resonaters are deleted the single muffler is center mounted right where they used to be . only a little further back.