Can’t comment on any others but I got hold of a second hand Remus cat back and I ****** love it. Bit noisy on cold start trying to go to work early in the morning but it doesn’t really bother me.
Is pretty un noticeable inside the car driving normal but is loud and drony over 80+ but its as I would expect. And the dsg farts are no longer farts they sound like gunshots which makes me giggle like a child.
Forgot to mention mine is un resonated too.