Boise prohibits modified exhaust, jake brakes in residential zones, and vehicle audio plainly audible at 50 feet. Idaho Code section 49-937 requires all vehicles to be equipped with functioning factory-equivalent mufflers.
Idaho Code section 49-937 mandates that every motor vehicle operated on Idaho highways be equipped with a muffler in good working order. Boise City Code Title 10 adds local enforcement of loud exhaust, modified straight-pipe systems, and engine braking (jake brakes) within city limits. Jake brake signs are posted on Broadway, Federal Way, and State Street where residential density abuts truck routes. Vehicle audio audible at 50 feet from the source is cited under BCC 10-8-05. Boise Police assigns dedicated traffic officers to Boise Bench and downtown corridors during summer cruise season.
Contact your local code enforcement office for specific penalty information.
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