Vehicle Mod Laws in New Jersey

Replacing the exhaust system is legal in New Jersey, but a muffler in good working order is required and cutouts or bypasses are prohibited. There is no statutory 'no louder than stock' rule — the standard is that the exhaust must not produce excessive or unusual noise.

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New Jersey 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 New Jersey. 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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No frame or marker holder may conceal or obscure any part of any marking imprinted on the plate or any part of any insert — which expressly includes the state name, not just the number.

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New Jersey requires an elevated-vehicle approval certificate for any elevation above the original vehicle height, and caps lift at 7, 9, or 11 inches by GVWR class.

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New Jersey's cover rule is narrow: opaque covers on auxiliary off-road lights are required only for elevated (lifted) vehicles seeking an approval certificate. Otherwise the limits are two auxiliary driving lamps mounted 12 to 42 inches and a four-lamp cap over 300 candlepower.

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New Jersey has no lowering-specific statute — its height rules target raised vehicles, which need an elevated-vehicle certificate.

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New Jersey requires lamps visible from directly in front to be substantially white, yellow, or amber; red visible from the front is prohibited, blue requires a permit reserved to emergency use, and flashing lights are prohibited except turn and hazard signals. Steady white or amber accent lighting is the safe configuration.

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New Jersey is explicit: tire tread may not protrude beyond the fenders, and fenders must cover the width of the tire tread. Fender flaps or flares may be added to provide the needed coverage.

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New Jersey bars any sign, poster, sticker, or other non-transparent material on the front windshield and front side windows, except items required by law. There is no top-strip or AS-1 allowance. A printed windshield banner is not legal in New Jersey.

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No aftermarket tint is permitted on the front side windows. Rear side and back windows: any darkness.

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