Exhaust Noise in Montana
Vehicle type: Sedan
Montana caps exhaust noise at 95 dB for all motor vehicles except motorcycles and quadricycles, measured under SAE J1169. A muffler in good working order is separately required and cutouts are prohibited.
Verified against primary sources · August 2026
Unlock the complete Montana report — all 11 mods, $5
Exact numeric limits, exemptions, penalties, and statute citations — for exhaust noise and every other mod we track.
One-time purchase. Instant download + emailed to you. See a sample report
Not useful? Reply to your delivery email within 7 days for a full refund.
Frequently Asked Questions
Are exhaust noise legal in Montana?
What are the exhaust noise limits in Montana?
Are there exceptions for exhaust noise in Montana?
Street-legal exhaust noise picks
Gear that helps you mod without a ticket in Montana.
Measure your exhaust at the test RPM before a fix-it ticket does.
Exhaust silencer insert →A removable insert that brings a loud exhaust back under your state's limit.
As an Amazon Associate, Is My Mod Legal earns from qualifying purchases made through these links, at no extra cost to you. We only recommend gear that helps you stay street-legal.