I have an fmf SST exhaust on my 2001 YZ250. I was wondering if oem o-rings and the FMF o-rings are interchangeable. Aso would anyone happen to know the o-ring dimensions and material. Thanks for any help.
I can't help you with this specific question, but I've found that if you take the pipe into any decent automotive supply store you can find an exhaust o-ring to fit for about a buck.
Better than o.e.m. too.