I have the 2019 monkey and installed the high compression piston from DHM and it ran so well I decided I would install one in my Grom. So the 2022 Grom has a DHM high compression stock bore piston, DHM S1 cam, chimera intake, Kemimoto exhaust and the DHM stage 3 ecu flash. Bike runs beautifully, more low end TQ and just pulls better and seems less labored doing it. I would recommend ALL of DHM products. Not a hard install just some basic tools and mechanical knowledge. If you are not going big bore than this is the next best option.