I would think the stock silencer would put you in the right db level. but im not positive on that. I am in wausau wi and we ride trails often and never have been messed with. my brother in laws 330r with ct pipe is waaaaay louder than my fmf and my lrd system.

its worth a try with the stocker, and if your friend has the db meter you should be safe to check before you even take it out again.

i have never ran a spark arrestor on a 2 stroke, are they any quieter than a non arrested silencer