Hey guys, you've really helped me in the past and need to lean on you again. I've got a 06 WR450F with a FMF Factory 4 exhaust. This bike is very loud and I'm going to White Rock Arkansas this weekend. First, does anybody know if there's a noise limit there? If so, what would you suggest to get this bike below the noise limit. I've checked the FMF website but nothing jumps out as far as a silencer. If anyone could post a link I would greatly appreciate it. I've got to get this thing quieter by Friday night. Any help would be awesome!!