Vehicle Mod Laws in Wyoming

Replacing the exhaust system is legal in Wyoming, 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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Wyoming 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 Wyoming. 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. Plates must be conspicuously displayed, securely fastened and plainly visible, secured against swinging, at least 12 inches from the ground, and maintained free from foreign materials.

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Wyoming sets no statewide lift, frame-height, or bumper-height limit. The only cap is overall vehicle height of 14 feet, and general equipment rules — headlamp height, working lighting — still apply.

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Wyoming requires no cover; no more than four front lamps may be lit at one time on a highway.

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Wyoming 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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Wyoming has no underglow-specific statute. The general lighting rules govern: no red or blue visible from directly in front, rear devices show red, flashing is reserved for authorized vehicle classes, and bright lamps must be aimed down.

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Wyoming has no fender, mudguard, mud-flap, or splash-guard requirement and no limit on tire protrusion.

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A sunscreening device may be used only along the top of the windshield and may not extend 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 Wyoming — only a clear tint band.

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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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