Muffler.

RCW 46.04.340
in effect
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"Muffler" means a device consisting of a series of chambers, or other mechanical designs for the purpose of receiving exhaust gas from an internal combustion engine and effective in reducing noise resulting therefrom. "Muffler" means a device consisting of a series of chambers, or other mechanical designs for the purpose of receiving exhaust gas from an internal combustion engine and effective in reducing noise resulting therefrom.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=46.04&full=trueFetched: 6/29/2026

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