I have a buddy with a 99 YZ400 that is in need of a quiet(er) spark arrested silencer for his bike as the stock MX silencer is freeking loud and illegal in Michigans woods. He dont have the $ for a new silencer and even the PMB insert for his stock can is around $200 with the quiet insert. hell he dont even have $ for piston/rings and chain and sprockets that he desperately needs... But then I got to thinking will a WR400/426 stock silencer work on his bike? There has got to be a few of those big black ugly oil cans out there cheep as they were pretty horible stock. But with the insert PMB sells for the stock WR can for $40 its gotta work better. That has got to be a cheeper solution for him. I know when the YZ/WR's 1st came out a lot of the parts were inerchangable. Would the WR silencer work on his bike? Thanks.