you can find cheaper, and might as well get the cheaper one. It is a tube... just buy the cheapest one off of ebay and then buy a k&n dryflow filter for the end of it.
tubes are tubes i.e. all the same. it blows my mind when people spend $800 for a name brand exhaust when a good exhaust shop can build the same thing for half that. 3" pipe is 3" pipe as long as the bends are done right.