Inliners International Forums General Discussion Engines Whats a good exhaust thats sounds muscular?

I just put a single 3" Flowmaster on my 250 this weekend that I had from another engine. I used 2" from the manifold to the muffler and 2 1/2" from the mufler back with a 3" baffeled tip. This sounds great at idle!! But under load it has that can sound. But it sounds great at idle!