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In the early 1970s, California native Don Elmer was an expert wrench for local friends and racers, helping to make their bikes the fastest on the track. The secret was in the exhaust systems, and Elmer had the process and products perfected to make any bike fly. It didn’t take long for word to get out, and soon, “Uncle Donnie’s Flying Machine Factory,” or FMF, for short, was founded. Production started with handmade pipes and exhaust systems, all crafted with an intense attention to detail, incredible level of craftsmanship, and high standard of performance.

Now, with a streamlined production and several years of experience and innovation under their belt, FMF has become an industry leader in exhaust systems, pipes, and products. Their reputation for crafting durable and high-quality products from premium materials has certainly helped FMF land that standing, but it’s not the only thing.

Racer-borne and racer-run, FMF has never forgotten why they got into the business in the first place, and their brand is so much more than just exhaust products. As a huge supporter of professional motorcycling and the lifestyle that comes with, FMF sponsors several race series and manufacturers an impressive casual line to give back to the community that has given so much to them. This dedication to the sport, along with the fact that their exhaust systems and parts are made in the U.S.A., from start to finish, are just some of the unique qualities that set FMF apart from the competition.

With parts and accessories for machines of various makes, models, and years, we stock a wide selection of FMF products that is sure to fit your needs. Shop now for popular products like the Turbine Core II Silencer, Gold Series “Gnarly Torque” Pipe, Power Core II Silencer, and more, along with accessories like wash plugs, two-stroke silencer packing, and pipe springs and o-rings.

Latest FMF Reviews – You could win up to $500 for reviewing products!

  • FMF Wash Plug

    Tuff in AB

    Good buy, necessary for keeping you bike clean and ...

    Fit great to my stock 1997 cr250 2-stroke pipe kept the exhaust dry great material they used durable, as well as flexible.

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  • FMF Pipe Spring & O-Ring Kit

    Chad in ME

    Reduced vibration

    Fixed vibrating and rattling sound. Cheap and easy

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  • FMF Q4 S/A Silencer

    Richard in BC

    Light with a bit more power, but fragile and unlike...

    The exhaust is lighter and offers a modest increases power over the stock XR650L exhaust and header. I bought both the header and exhaust. It was easy to assemble with high-temp silicon and no exhaust gaskets. After assembling, I noticed the header barely cleared the engine with about 1 mm clearance. Unlike the stock, there was over 2 feet distance between the exhaust frame mount and hanger in the rear, leaving the exhaust poorly supported. Within one year my exhaust broke at the weld. Dealing with FMF warranty was a frustrating waste of time; no discussion, one response and an automated phone system that took me in circles. In the end, they refused to honor their warranty because my exhaust had scratches and a dent in the aluminum. This exhaust may be lighter, but it is definitely not strong enough for a XR650L.

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  • FMF Factory-4.1 RCT Aluminum Silencer with Carbon End Cap

    DAVID in CA

    Poor fitment, impossible to remove spark arrestor.

    For a 2019 Yamaha 250F. Mounted it multiple times, even with the header removed, and the pipe would contact the frame ever so slightly. FMF support was slow to respond and never resolved my issue. Spark arrestor is an extremely tight fit and I am unable to remove it now, even with vice grips. This same pipe for my 2017 250F was excellent, but I'm not impressed with this one.

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  • FMF Turbine Core II Silencer

    Michael in OR

    Bolts right up no tweaking

    Bought for some 50 fit good mounted up pretty easily. No noticed power difference but has spark arrester got trails

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  • FMF Power Core IV S/A Exhaust System

    Michael in NY

    FMF raptor 80 full exhaust

    Super easy to install and sounds amazing. Noticeable power increase with pipe and jetting change. Wish it came with the quiet core insert like it’s big brother but this one is staying in the yard so no big deal.

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