How do I silence a stock exhaust

FOUND IT!!! Here's a pic of the "Sierra Mist" soda can I installed on my son's KX60. I filled it with steel wool and hose-clamped it to the stock "silencer". The I drilled a few 1/4" holes around the rear edge. It cut the noise in half and didn't noticeable effect the performance of the bike.

jdunn wrote:

What size hole do y'all think I need and how many holes?

Start with 4 (four) 1/4" diameter holes and adjust as needed. Just get out to the garage and experiment. You'll find something that works.   

Finished! There is little noise coming from the exhaust. Filled it with insulation. It is packed pretty good. And to keep the insulation from feeding out I used screen wire.

Nice! See, There's a point where asking more questions isn't going to help, Just go out and do it! Nice work!