Sound/Video Clips of aftermarket pipes?

Anyone have any of these since i want to go aftermarket but i want the best sounding/performing one I need low end torque...
Thanks
erik

Everybody has there picks I like the yoshimura but they cost more than the others. Please don't get FMF they suck.

it is a personal preferance on which pipe, do you want a loud one or a quite one? they all pretty much produce the same horsepower, some are better than others at that, you should find the dirtwheels shootout they did on pipes for the 400, right now I have a fmf powercore 4, it increased the lower end power but I have about the same top hp as stock, but the thing is loud, I have the loudest bike of the people I ride with. I am going to get a yoshimura pipe. it should give me more hp and be quiter