Vehicle Mod Laws in Indiana

Replacing the exhaust system is legal in Indiana, but a muffler in good working order is required and cutouts or bypasses are prohibited. Modifications that make the exhaust louder than the originally installed muffler are prohibited.

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Indiana 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 Indiana. 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 Indiana as long as nothing required stays hidden. The plate must be clearly legible, free from foreign materials, and not obstructed by accessories or opaque objects.

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Indiana requires passenger cars originally equipped with bumpers to keep them, and bumper height may not vary more than 3 inches from the original manufactured height.

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Indiana permits two fog lamps, one auxiliary passing lamp, and one auxiliary driving lamp, with no cover requirement — but no more than four front lamps over 300 candlepower may be lit at one time on a highway.

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Indiana limits passenger-car bumper height to within 3 inches of the original manufactured height — a rule that constrains lowering and raising alike.

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Underglow is legal in Indiana, including while driving, subject to color and flashing limits: No red or blue, no flashing, and front-visible light limited to white or amber; green is reserved for EMS.

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Indiana has no fender, mud-flap, or wheel-protrusion provision — only the general 8-foot-6-inch width limit applies.

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A strip is allowed on the uppermost part of the windshield, extending no further down than the AS-1 line. Because the material must be transparent, a printed or opaque banner is not legal in Indiana — only a clear tint band.

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Front side windows: minimum 30% VLT. Rear side and back windows: minimum 30% VLT.

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