Perfect fit and made in the USA. So quiet that you can hardly tell if the engines are running or not. Now I can hear jazz while driving on the freeway, which wasn't possible with the previous Chinese-made SS muffler. And no noticeable loss of performance. This is important if you drive a Si hatchback. The previous muffler did not provide adequate back pressure. Like motocross bikes, Honda engines are finely tuned, and a lack of proper back pressure results in a loss of power.