Vehicle Mod Laws in Oklahoma

Replacing the exhaust system is legal in Oklahoma, 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 specifically prohibited.

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Oklahoma 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 Oklahoma. 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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Frames are legal if nothing is obscured, but every kind of cover is banned.

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Oklahoma has no statutory lift, frame-height, or bumper-height limit. General equipment rules — lighting, fenders over the rearmost wheels, the 13-foot-6 overall height cap — still apply.

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Oklahoma expressly allows off-road lamps if they are mounted at least 42 inches from the ground, wired independently of all other lighting, and turned off whenever the vehicle is driven on a highway. No cover is required.

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Oklahoma has no statute limiting how low a vehicle may be. General equipment rules — headlamp height, working lighting, nothing dragging on the road — still apply.

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Underglow is legal in Oklahoma, including while driving, subject to color and flashing limits: No red, blue, or green visible from directly in front, and no flashing or oscillating (a misdemeanor).

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Oklahoma requires a rubber or fabric apron directly behind the rearmost wheels of any vehicle not equipped with fenders over them, sized to prevent spray thrown at tangents exceeding 22.5 degrees from the road surface.

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Sunscreening is allowed along the top only — not below the AS-1 line or more than 5 inches from the top, whichever is closer to the top. Because the material must be transparent, a printed or opaque banner is not legal in Oklahoma — only a clear tint band.

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Front side windows: minimum 25% VLT. Rear side and back windows: minimum 25% VLT.

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