I haven't heard of it until now, let alone seen one. As far as the aftermarket exhausts systems IMHO, leave them for the race tracks. The increased noise just annoys others on the trails, if you are truly serious about going faster upgrade the suspension first, it has plenty of power and speed from the factory that exceeds the shocks ability to handle terrain as it is. However if loud pipes make you think you are going faster have at it, that extra 1/100 of a second gain 0-40 still don't let you outrun the speed of the sound it will make.