This is the best catalyst I have ever used (I have run through many Magnaflow converters). It looks good, it's easy to install, the price is good and it flows very well. It doesn't change the sound much either, but it's quieter. I have a 3" single exhaust with a Flowmaster muffler on the end. With the Magnaflow clogged (my car runs a little rich) the car was a long way from passing the emissions. With the Flowmaster this goes far. Nothing to regret. I would not manufacture any goods in Chinaโฆ