Exhaust is off a 2022 FC250. It will fit 2019-2022 KTM and Husky 250s. I’m not 100% sure on GasGas but please check. Great shape just has one minor dent from roost.

It also will bolt up and work on 19-22 KTM and Husky 350s. FMF does sell a different pipe for 250 and 350. Being this is the 250 version the U in the pipe isn’t as deep as the 350 version. You will loose some top end power but will have more low end. I’ve used it on a 2021 FX350 with no issues.