I have tried a couple different things on my quad and on my bike, while the higher priced systems like BOSS audio work well the install of them and size was kind of a turn off plus cant use it on all my toys. I found the Trail Thumper from Firehouse Technology on Ebay and it works very well plus does not have to be wired in, and also can be used on by bike. Posted a few pics, they updated it and by adding the 90 degree bends on end (they are coming out with there own soon but made my own) it really amplifies sound. Just wanted to share for anyone looking for an inexpensive system for there quad or bike. There is video to on there Facebook page of what they have.

https://www.facebook.com/pages/FireH...7968369?ref=hlthumper on red quad.JPG10501498_10204507349272451_145795480_n.jpg