Could I get some feedback about customizing exhaust on 400ex? Anyone that has drilled holes in silencer please respond-What results you achieved? How many and what size holes did you drill? All I have done is cut spark arr. off endcap. Thanks---Mike Boone

 

I made a pretty lengthy post refering to this awhile back. Here is the URL: http://forums.atvconnection.com/thre...B=1&TID=256880

 

thanks for info---mb

 

rampage

Did you have to rejet after you did this mod? I read you post and you were contemplating a jet check.