- The straight through design of the spark arrestor canister and the performance flow stainless steel end cap ensures strength, durability and most importantly, track and trail proven unrestricted power
- The 2.1 utilizes a shape inspired by the 4.1 system
- Utilizes exclusive FMF "Turbine Dampening System"
- U.S. Forest Service legal status
KTM -- 50 SX -- (2016, 2017, 2021, 2021, 2022, 2023, 2018, 2019, 2020); Husqvarna -- TC 50 -- (2021, 2021, 2022, 2023, 2019, 2020, 2018, 2017); Gas Gas -- MC 50 -- (2021, 2022, 2023)