Almost all catless will sound identical. not worth buying the crazy expensive ones, I Have tested the $150 ebay ones, and the 500 catless name brand ones. same thing
I have cat less ETS with stock exhaust. And I would have to agree with the above posts. Its a good quality piece with really nice welds. I also like they it is a larger diameter than most for a longer portion of it, but thats only inches. But in the end I think they all are about the same. It sounds good and isn't too loud at all. With windows up and valve closed it sounds nearly the same as stock. But valve open and WOT you can definitely hear it and so will others.