I got all my pipe, carb and silencer for my 310 pv from ESR and they made me a S/A silencer 3 inches longer than normal. I just slipped it on my stock 250r with a PSI pipe and its definitely quieter than the FMF turbine core but still pretty loud. In WI there's no good job for trying its a ticked if over 96db. I'm gonna pick up a DB tester from radio shack later today and play around with it. I was looking at the super trapp disk set up in 3" and trying that. Along time ago my buddy bought a 250r that had a Richter privateer and it came with a slip on disk set up that made it real quiet. http://www.denniskirk.com/jsp/produc...fCatId=&mmyId= This is the disks and there is open and closed end covers I think the 3 inch could be used on my ESR silencer. CT uses these on the 4 stroke stuff. I realize there will be power loss making a 2 stroke quiet but I'm not in competition with any one just want to be legal when riding the trails. By the way this ESR silencer I got is well worth the money compared to the FMF and other mass produced units. It is all billet parts and looks great and on my FMF all the nutserts for fastening in the end caps all spin and in a pain to repack now.