elevation is 150 ft above i have read alot on plug chops i have a good understanding on jeting the carbs. I was just wondering if the stock silencers would work and maybe what a good starting point would be. Oh and if you can point me to a site for a good used set used silencers for 40 bucks that would be great as well ever time i see them on Ebay they go for 60 to 70 bucks may not seem like alot but i am truly a poorboy. And thanks for the reply ill take all the help i can get i would die if i burned up my ride. :shoothead: