The material quality seems to be good. It definitely leaks exhaust, so the seal when the cutout is closed could be better. Since the 4" cutout uses a universal flange, it's very large and caused clearance issues for me. I had to modify it. A normal 3 bolt flange would be much better. I was unable to use the turn down due to ground clearance issues on my lowered car. It did bolt up just fine, but I had to take it off. That's no fault of the cutout. We'll see how well it holds up over time.