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Washington Exhaust & Muffler Laws (2026)

Info: Muffler in good working order required; cutouts/bypasses and exhaust amplified above factory muffler prohibited (no statutory dB) — RCW §46.37.390.

InfoVerified Jun 19, 2026

Muffler in good working order required; cutouts/bypasses and exhaust amplified above factory muffler prohibited (no statutory dB) — RCW §46.37.390.

Official source: app.leg.wa.gov →

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