No, Wyoming prohibits exhaust systems producing excessive noise under Wyo. Stat. Ann. § 31-5-942, mirroring federal EPA noise standards. Local jurisdictions like Cheyenne and Jackson enforce stricter decibel limits via municipal ordinances, with 2026 revisions expected to align with updated EPA guidelines. Violations may result in fines up to $750 or vehicle impoundment.
Key Regulations for Loud Exhausts in Wyoming
- Decibel Limits: State law caps exhaust noise at 92 decibels for motorcycles and 88 decibels for passenger vehicles, measured at 50 feet. Laramie County enforces 86 decibels for residential zones.
- Modified Exhaust Systems: Aftermarket “straight pipes” or cutouts are illegal unless factory-equipped. The Wyoming Department of Transportation (WYDOT) conducts annual inspections in Casper and Gillette to verify compliance.
- Local Ordinances: Cheyenne’s municipal code (Chapter 10) bans exhaust noise exceeding 85 decibels between 10 PM–7 AM, while Teton County applies EPA Tier 3 standards for off-road vehicles near national parks.
Enforcement prioritizes vehicles with visible modifications or audible complaints. The Wyoming Highway Patrol (WHP) collaborates with county sheriffs to issue citations, particularly during summer tourism seasons in Jackson Hole. Non-compliant vehicles may face mandatory muffler installation or court-mandated repairs.