With well over 35 years of racing experience behind it, the Fatty Gold Series pipe delivers race proven performance. The Fatty broadens and smoothes 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. Can be used with FMF or stock silencer (unless noted) Fits: Gas-Gas MC 65 2023 GasGas MC65 2021 Husqvarna TC 65 2023 TC65 2017-2021 2023 KTM 65 SX 2016-2023 SX 65 2023