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Colorado Exhaust & Muffler Laws (2026)

Info: Adequate muffler required; cutoff/bypass and exhaust mods raising noise above stock prohibited (no fixed dB for passenger cars) — C.R.S. §42-4-225.

InfoVerified Jul 22, 2026

Adequate muffler required; cutoff/bypass and exhaust mods raising noise above stock prohibited (no fixed dB for passenger cars) — C.R.S. §42-4-225.

Official source: leg.colorado.gov →

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