does a performance exhaust pipe really make a difference?

[jct842]

On my 150 I welded up an adapter to screw on a briggs and stratton muffler. Got a tiny bit of gain but the biggest advantage is the weight I lost hanging off the back of the motor. So many have OEM mufflers that viberate, crack, fall off, and ruin the rest of the pipe coming off the head. It was a bunch louder but never got loose or had any problems with it. Along with the muffler I put a free flowing air filter on so I did rejet. As far as loud, no louder than when you mow the grass! Maybe a little less.