There's always the question as to whether or not you should swap out your motorcycle's stock exhaust system for something special. Aftermarket pipes are cool, louder, add horsepower, and are often lighter weight.
However, your stock pipe is still pretty darn good, and depending on what's out there, you may just want to keep it attached to your motorcycle and forget the aftermarket stuff.
I've never felt the need to put an aftermarket pipe on a bike, but then I'm not much of a racer, and I don't care if my bike sounds awesome. If you feel you need one, make sure you think about the reasons why.
To get the lowdown on motorcycle aftermarket exhaust systems, check out the video below posted by Motorcyclist Magazine. In the video, Ari Henning gets into all the stuff you need to know.