I have a 2010 Volkswagen GTI. I have an aftermarket 3" CTS downpipe (catalytic converter removed). It wasn't as loud as I wanted so I replaced my original resonator with this bright 1792 and now it sounds good! Much more volume, a bit of droning, which doesn't bother me at all. I considered just removing the resonator, but it's a much tamer sound. He cleans the rasp. Honestly, it sounds almost as good as my $500 Magnaflow brethren.