Vehicle Mod Laws in Mississippi

Replacing the exhaust system is legal in Mississippi, but a muffler in good working order is required and cutouts or bypasses are prohibited.

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Mississippi sets no statewide decibel limit for passenger cars. A muffler in good working order is required, exhaust may not produce excessive or unusual noise, and cutouts or bypasses are prohibited.

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Smoked or tinted film on headlights and taillights is illegal in Mississippi. Headlights must emit white light and taillights must show red at the required visibility distance, and tint that dims or discolors them violates those requirements.

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License plate frames are legal in Mississippi as long as nothing required stays hidden. The tag must not be covered or obstructed by any object, sticker, paint, or plate bracket — except that the county name may lawfully be covered.

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Mississippi has no bumper- or frame-height limit. Instead it bans the squat stance: it is unlawful to drive a passenger vehicle whose suspension, frame, or chassis has been altered so the front fender sits 4 or more inches higher than the rear.

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Mississippi permits two auxiliary driving lamps mounted 12 to 42 inches on the front plus one spot lamp, in white or amber only, aimed out of approaching drivers' eyes. No cover is required.

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Mississippi sets no minimum height — but since July 1, 2024 the squat law cuts both ways: the front fender may not sit 4 or more inches higher than the rear, which outlaws rear-only lowering. An even drop remains unregulated.

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Underglow is legal in Mississippi, including while driving, subject to color and flashing limits: Blue is limited to law enforcement, red is restricted to emergency uses, and alternating flashing headlights are banned.

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Mississippi has no fender-coverage or tire-protrusion restriction for passenger vehicles.

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Mississippi allows no aftermarket windshield strip — tinted film, glazing, or darkening material on the windshield is prohibited apart from the manufacturer-authorized sun shield. A printed windshield banner is not legal in Mississippi.

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Front side windows: minimum 28% VLT. Rear side and back windows: minimum 28% VLT. Darker limits apply behind the driver on some larger vehicles.

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