No, Mexico prohibits excessive exhaust noise under NOM-042-SEMARNAT-2003, enforced by SEMARNAT and local transit authorities. Modifications violating decibel limits (typically 92 dB for motorcycles, 95 dB for cars) risk fines, confiscation, or criminal charges under the Federal Penal Code. Recent 2026 amendments tighten enforcement, mandating periodic inspections in urban zones like CDMX and Monterrey.
Key Regulations for Loud Exhausts in Mexico
- NOM-042-SEMARNAT-2003: Sets maximum noise levels (92–95 dB) for vehicles, with stricter urban thresholds (88 dB in CDMX).
- Federal Penal Code (Art. 420): Criminalizes modifications causing “public risk,” punishable by 1–9 years imprisonment for severe violations.
- Local Transit Bylaws: CDMX’s Reglamento de Tránsito (2024) and Jalisco’s Ley de Movilidad (2025) authorize immediate vehicle impoundment for non-compliant exhausts.
Enforcement targets modified exhausts in high-traffic corridors, with SEMARNAT collaborating with state prosecutors to prosecute repeat offenders. Aftermarket parts must bear NOM certification; uncertified systems are presumed illegal. Violators face escalating penalties, including mandatory muffler replacement at owner expense.