Silencer vs Spark Arrester

Difference

The basic difference is in the name; a Spark Arrestor prohibits particulates of a over a certain size to escape the pipe, a Silencer reduces sound output via mechanical (chambers, baffle plates, Etc.) or sound deadening material (fiberglass, synthetic wool, Etc.) wrapped around a perforated core. Most modern Spark Arrestors also have a silencing component but, Silencers do not have Dept. Of Forestry approved spark arrestors.
Regardless of whether or not it is enforced, if we, as motorcyclists, do not make a concerted effort to ride quiet and respect the land we will continue to lose land! It seems as though people don't remember the good we do, i.e.; benefit rides, area clean ups, Etc. But they never forget an annoyingly loud bike, or unneccesary damage we do.
Okay, off the soap box now! :blah:
Enjoy your KDX, whatever you decide to do with the exhaust. Extensive dyno testing has shown that a Silencer/Spark Arrestor power loss is almost immeasurable when a motor is properly jetted for the conditions.

How about not catching the swamps on fire? :-)

You can't ride on USFS land without a spark arrestor (not legally). Silencers are more for closed course competition.

I have read (no actual experience) that an after market spark arrestor has little or no power advantage over the standard one. I think there may be a weight advantage though. If you search these forums someone has actually measured the weigh difference and posted the results here.

Yeah, as far as performance the aftermarket silencer isn't gonna do much for you. They do look better though, lol.

J.