I get rid of my Senner Tuning Catback Exhaust system with no noise for this Short Tail. I add the first Z1 motorsports Y pipe with the OEM midpide to the Short Tail. It's Really change the sound of the car aggressive and beefy, but at 2800 at 3200 RPM you got drone and resonance. But it don't bother me so much. Good product.