Vehicle Mod Laws in Alabama

Replacing the exhaust system is legal in Alabama, 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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Alabama 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 Alabama. 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 Alabama as long as nothing required stays hidden. The plate must remain plainly visible; there is no explicit cover ban.

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Alabama sets no statewide lift, frame-height, or bumper-height limit. The only cap is overall vehicle height of 13 feet 6 inches, and general equipment rules — headlamp height, working lighting — still apply.

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Alabama allows auxiliary lamps on the road — no cover is required and they need not be switched off — but only one auxiliary driving lamp (mounted 16 to 42 inches), two fog lamps, and one spot lamp are permitted, and anything over 300 candlepower must be aimed so no part of the beam strikes the road beyond 75 feet.

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Alabama has no lowering, bumper-height, or frame-height statute — the only practical limit is keeping headlamps within their required 24–54 inch mounting height.

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Underglow is legal in Alabama, including while driving, subject to color and flashing limits: No red visible from the front, no blue (emergency mimicry), and no flashing.

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Alabama has no fender-coverage or wheel-protrusion statute — tires may extend past the fenders. Only the general 8-foot-6-inch vehicle width cap applies.

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A transparent strip is allowed on the uppermost 6 inches of the windshield, and it may not be red or amber. Because the material must be transparent, a printed or opaque banner is not legal in Alabama — only a clear tint band.

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Front side windows: minimum 32% VLT. Rear side and back windows: minimum 32% VLT. Darker limits apply behind the driver on some larger vehicles.

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