OXA Exhaust Accessory Kit. The OXA Factory Exhaust Accessory Kit is a premium solution for replacing worn-out exhaust mounting hardware on your 2-stroke. Designed and tested in Spain by professional riders, this kit ensures a secure, vibration-resistant connection between your exhaust pipe and silencer. Features: Designed to reduce exhaust vibration and extend part life. Heat-resistant and secure sealing components. Used and tested by pro riders in real enduro conditions. Includes: Two (2) Silent Blocks (rubber vibration mounts). Two (2) Exhaust O-Rings (heat-resistant Viton). Two (2) Exhaust Springs with swivel hooks. One (1) Rubber Sleeve for the silencer joint.