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Internal Thread M38 x 1
the Yoshimura USA RS-4 Muffle are at the cutting edge of exhaust technology
Standard diameter: 66 mm
Ultra thin flexible silicone body
Helps engine start after wintering
TWIN AIR Pre-Oiled Decibel Reducer Air Filter - 152213DRX WP - Tool/transport Internal Thread M38 x 1Twin Air brings race proven technology to consumers with the new Decibel Reducer (DR) foam . With the FIM implementing the 109dB noise limit, manufacturers have had to adapt their engines to comply. Twin Air also explored solutions to meet this benchmark while maintaining performance. During the 2025 MXGP season, noise control was already set to 109dB. Working closely with factory teams, we developed a solution to reduce intake side noise. Leveraging
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