Low quality, no sound
My brother is 12 years old. The quad is a Custom Cannondale with an restricted KTM 250 4-stroke enduro engine with electric start. The seat has been lowered and placed more forward. And it has a center mounted exhaust. The rear shock is from a Cannondale dirtbike, wich works way better then a quad shock.
This thing has a low center of gravity and a low weight, wich results in an amazing handling.
http://www.youtube.com/watch?v=rPnJxtfN1_4
http://www.youtube.com/watch?v=p8O1ge0i-iY
http://www.youtube.com/watch?v=vispShO6DWY
http://www.youtube.com/watch?v=A0Fgoq5NjQM