C@tless DP's with stock exhaust (back) sounds great. Perfect combo IMO.
As stated above go with a good fitting DP.....spend the extra money, it's worth it.
2011 Mineral White M3 ZCP
Paint Correct, Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake
2014 Mineral White 328d Xdrive Wagon
stock for now