Sioux Falls Code § 93.008 prohibits operating a motor vehicle unless its exhaust system is free from defects, fitted with a muffler/noise-dissipative device, and has no cutout/bypass. Pass-by limits measured at 25 feet, 4 feet height: 80–84 dBA for passenger vehicles and 90–94 dBA for trucks over 10,000 lb GVWR/GCWR (varies by posted speed limit).
Motor-vehicle noise in Sioux Falls is governed by § 93.008 of Chapter 93. The exhaust-system requirements are mandatory: every vehicle must have an exhaust system (1) free from defects that affect sound reduction, (2) equipped with a muffler or other noise-dissipative device, and (3) NOT equipped with any cutout, bypass, or similar device. Measurement protocol mirrors § 93.001: A-weighted dBA, at least 25 feet (7.5 m) from the vehicle, at least 4 feet (1.2 m) above the surface. Pass-by maxima are stratified by GVWR and posted speed limit — vehicles ≤10,000 lb GVWR are capped at 80 dBA (≤35 mph zones) or 84 dBA (>35 mph zones); vehicles >10,000 lb GVWR/GCWR are capped at 90 dBA (≤35 mph) or 94 dBA (>35 mph). § 93.002 separately prohibits sound from any amplified device in a parked vehicle that is plainly audible at 50 feet, or in a moving vehicle plainly audible at 100 feet, between 10:30 p.m. and 6:00 a.m. (the 'boom-car' rule). South Dakota state law (SDCL Chapter 32-15 vehicle equipment, SDCL § 22-18-35 disorderly conduct) provides additional backstops. Enforcement is by SFPD traffic officers, who may cite under either the city code or state vehicle-equipment rules.
Citation under § 93.008 (municipal traffic infraction) — fine, vehicle equipment-correction order. Boom-car violations under § 93.002 carry separate municipal penalties. Repeat exhaust violations can trigger SDCL Chapter 32-15 equipment violations and inspection requirements.
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