Hi fellas, fitted a new cat again the other day, as old one was rattling inside and got a new one under warranty. I never replaced the gasket ring that joins the front and back together, and it is sounding a bit noisy. Looking on ebay and the ones advertised aren't the same as what's on the car are they an upgrade? The one that's on the car is like a metal mesh and the ones on ebay look like a solid ring.