Best sounding test pipes out there! absolutely No Drone & No Rasp! (coupled with a New Invidia Gemini Cat Back) I also loved the fact that we can use the OEM solid ring crush gasket between the manifold & test pipes, (OEM Gasket Part # 20691-19U0A) remember to buy x2,1 ring gasket per side. Zero Leaks. The car sounds very refined with this setup, I'm very happy with it.