I understand that aftermarket pipes change the note of a bike, the look and increase the BHP, but is that it? Can you get different pipes from the same manufacturer for 1 make and model of bike? Do different manufacturers make different styles of pipe for a given model (high exhaust outlet, classic look, carbon, etc)? Do they all do the same thing to varying degrees (e.g. Staintune do more BHP but Yoshi has a better note)? Is it best to go with a good manufacturer or go for a pipe that best suits your needs?