First of all, what is a exhaust plug for, and what does it do? Here is a link to a picture of an exhaust plug http://www.yamaha-motor.com/sport/apparel/apscitemdetail/3/125/all/1/669/detail.aspx
Another question. What are spark arrestors and i know that you need spark arrestors for biking parks such as hollister hills... but is it just a screen? or is it something more, because im looking to get a new exhaust tip, and it has a picture of it and it looks like there is a screen but im not sure if that is what a spark arrestor is. THANK YOU! and if anybody knows where i can get yamaha ttr 230 plastic for cheap, that would help
here is a picture of the exhaust tip im looking at. http://www.amazon.com/Yamaha-TT-R230-TTR230-Billet-Exhaust/dp/B001706EW0/ref=sr_1_1?ie=UTF8&qid=1242951587&sr=8-1
Exhaust plug is something you put in the end of your muffler while you are washing the bike to keep water out. A spark arrestor keeps sparks from flying out the exaust so you don't burn the woods down. Spark arrestors do not rob any power at all. A bike like the TT-R comes from the factory with a spark arrestor. Motocross bikes do not come with spark arrestors, and you have to either put a Sparky clamp-on spark arrestor on the end of your silencer or replace your silencer with a spark arrestor silencer.
Some spark arrestors are a screen. Some just change the flow of exhaust before it exists so it cools enough to not be sparks before it exits. A spark arrestor has to say that it is approved by the USDA Forest Service on it. If it does not have a stamping that says it is an approved spark arrestor on it anywhere, it cannot be used at places like Hollister Hills.

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