Factory Fatty Exhaust Pipe 18-23 GasGas Rieju 250 300 EC MR PRO - FMF 025219

Engineered for serious performance, the FMF Racing Factory Fatty 025219 exhaust invokes the legacy of “works” or cone-style pipes previously reserved for factory riders. Built with superior craftsmanship and high-quality materials, this exhaust system expands and smooths the power curve of your two-stroke engine, offering more power at low and mid RPMs, as well as enhanced over-rev. Whether trail riding or racing, the Factory Fatty delivers consistent, broad power gains to elevate your riding experience.

Features

• Constructed from lightweight 20 gauge steel for the body


• Utilises 19 gauge steel in the header section for durability


• Hand-pounded seams ensure smooth exhaust flow transitions


• O-rings included for reliable sealing on most models


• Broadens and smooths power delivery across the RPM range


• Provides notable gains in low-end, midrange, and over-rev power


• Designed for direct fitment and easy installation

Specifications

• Item ID: 025219


• Pipe type: Expansion chamber


• Body material: 20 gauge steel


• Header material: 19 gauge steel


• Carb warning: None

Vehicle Fitment

GAS GAS

• 250 (2018–2019)


• 300 (2018–2019)

RIEJU

• MR PRO 250 (2020–2023)


• MR PRO 300 (2020–2023)