I just got another '87 250R after not having one since '93. My R has a stock engine with FMF Fatty pipe and silencer, which is leaking at the exhaust flange and where the silencer / pipe meet. What would be the best way to stop those leaks? Would new seals on the flange work as good as those new billet flanges? And does anyone sell those collars to seal the pipe / silencer? Any suggestions will be appreciated! Thanks!