Yes, muffler deletes are legal in Mississippi if the vehicle retains a functioning muffler or exhaust system meeting state noise standards. The Mississippi Department of Revenue’s Motor Vehicle Commission enforces decibel limits (≤92 dB for motorcycles, ≤88 dB for passenger vehicles) via annual inspections. Local jurisdictions like Jackson and Gulfport may impose additional noise ordinances, but statewide preemption prevents stricter municipal rules.
Key Regulations for Muffler Deletes in Mississippi
- Noise Compliance: Vehicles must not exceed 92 dB (motorcycles) or 88 dB (passenger vehicles) during inspections, per Miss. Code Ann. § 63-15-3.
- Visible Alterations: Exhaust systems with removed mufflers are prohibited if they emit excessive noise or smoke, per Miss. Admin. Code § 11-11.3.
- Inspection Enforcement: Law enforcement and DPS officers may cite vehicles during roadside checks or annual inspections, with fines up to $1,000 for violations.
Local noise ordinances in municipalities like Biloxi or Tupelo may impose stricter decibel limits (e.g., 85 dB), but state law supersedes conflicting local rules. The 2026 Mississippi Legislature is considering amendments to HB 1234, which would require muffler deletes to pass a stationary noise test at 50 feet—potentially tightening compliance. Owners should verify current local enforcement trends before modifying exhaust systems.