FMF Exhaust - 44449 - Header - S/S - Megabomb

The FMF Racing MegaBomb is a stainless steel header and mid-pipe assembly (part number 44449) built as a direct replacement for the standard front section on Yamaha's 250cc four-stroke competition models. It fits the YZ250F 2019–2026, YZ250FX 2020–2026 and WR250F 2020–2024.

It suits motocross, enduro and off-road riders who want to upgrade the front half of the exhaust system, either on its own or paired with an FMF slip-on muffler. The MegaBomb name refers to FMF's expansion chamber built into the head pipe, and the stainless steel construction is chosen for its durability in racing conditions.

Fitment is model and year specific — please confirm your bike's year and model before ordering.

• Stainless steel header and mid-pipe assembly
• FMF MegaBomb head pipe design with integrated expansion chamber
• FMF part number 44449
• Fits Yamaha YZ250F 2019-2026
• Fits Yamaha YZ250FX 2020-2026
• Fits Yamaha WR250F 2020-2024
• Replaces the standard front pipe section; pairs with FMF slip-on mufflers

Confirm your bike's exact model and year before fitting - this pipe is fitment specific.
Fit while the engine is completely cold, and check that the exhaust gasket or seal at the head is in good condition before assembly.
Leave all joints loose during assembly, align the full system from the head to the muffler, then tighten evenly so the pipe is not pulled into strain.
Re-check the header fasteners and muffler springs after the first heat cycle and periodically after that, as fasteners can loosen with heat and vibration.
Avoid touching the pipe with bare hands before riding; oils and fingerprints can bake into the stainless surface and cause staining.
Let the pipe cool fully, then clean with a soft cloth and a mild detergent or a stainless-safe cleaner; avoid harsh abrasives and steel wool, which will scratch the finish.
After wet or muddy rides, rinse mud off the pipe promptly and dry it to reduce staining and surface corrosion.
Inspect regularly for dents, cracks and leaks at the joints, particularly after a crash, and check that the pipe still has clearance from the frame, radiator and plastics.
Do not use high-pressure water directly into the exhaust outlet, and block the outlet when washing the bike.
Store the bike in a dry area; if it is standing for long periods, a plug in the outlet helps keep moisture and debris out of the system.