Features:
- With well over 35 years of racing experience behind it, the Fatty Gold Series pipe delivers race proven performance
- The Fatty broadens and smooths out the power curve while boosting gains throughout the entire power band, more low-end, more mid, and increased over-rev
- No matter what type of riding you do, the Fatty has the benefits you’re looking for
- More tractable power, improved throttle control
- Provides power gains throughout entire power band
- Carbon steel with a nickel plated finish for maximum durability
- FMF Racing’s Tru-Flo stamping process ensures a perfect fit and optimum performance.
- O-Rings Included
- NOTE: Will not pass 2025 FIM sound regulation
Fit the models:
| BETA |
XTRAINER 250 LC |
2019 |
| BETA |
XTRAINER 250 LC |
2020 |
| BETA |
XTRAINER 250 LC |
2021 |
| BETA |
XTRAINER 250 LC |
2022 |
| BETA |
XTRAINER 300 LC |
2015 |
| BETA |
XTRAINER 300 LC |
2016 |
| BETA |
XTRAINER 300 LC |
2017 |
| BETA |
XTRAINER 300 LC |
2018 |
| BETA |
XTRAINER 300 LC |
2019 |
| BETA |
XTRAINER 300 LC |
2020 |
| BETA |
XTRAINER 300 LC |
2021 |
| BETA |
XTRAINER 300 LC |
2022 |

FMF - Flying Machine Factory - 1973 was founded by a twenty-two-year-old named Donny Emler, a typical Southern Californian who, like everyone else in the 1970s, found a passion for riding and racing dirt bikes. FMF is now one of the most recognizable logos in motocross. The main area of FMF is the highest quality exhaust systems for dirt bikes.
| Brand |
Model |
Year |
Name |
CC |
| BETA |
XTRAINER |
2015 |
|
300 |
| BETA |
XTRAINER |
2016 |
|
300 |
| BETA |
XTRAINER |
2017 |
|
300 |
| BETA |
XTRAINER |
2018 |
|
300 |
| BETA |
XTRAINER |
2019 |
Oil mix |
250 |
| BETA |
XTRAINER |
2019 |
Oil mix |
300 |
| BETA |
XTRAINER |
2020 |
Oil mix |
250 |
| BETA |
XTRAINER |
2020 |
Oil mix |
300 |
| BETA |
XTRAINER |
2021 |
Oil mix |
250 |
| BETA |
XTRAINER |
2021 |
Oil mix |
300 |
| BETA |
XTRAINER |
2022 |
Oil mix |
250 |
| BETA |
XTRAINER |
2022 |
Oil mix |
300 |