Complete Guide to Vehicle Modification Laws in Michigan
Michigan enthusiasts have plenty of room to customize their rides, but the state does enforce specific numeric limits on everything from ride height to exhaust noise. This guide breaks down the most common modifications and what the law actually says about each one. The figures in this guide were verified against primary statute text (August 2026), so you can trust the numbers below reflect the current law.
Lowering
Status: Conditional
Michigan uses what's often called a suspension rim-line rule: no part of the suspension may extend below the lowest portion of a wheel rim, and the body or chassis may never make contact with the ground. Beyond that, the law requires that lowering not expose the fuel tank to damage from collision, and wheels may not contact the body.
The original suspension may not be disconnected or modified in a way that defeats safe operation. If you keep the suspension above the wheel-rim line, keep the body and chassis clear of the ground, and leave the original suspension connected, your lowering job stays within the law.
This is governed under MCL 257.710c. Check the full lowering laws page for details.
Underglow
Status: Conditional
Underglow lighting is legal in Michigan, but only in one context: parked on private property. While driving, underglow is prohibited — any non-permitted lamp must be unlit and covered while operating on public roads.
This falls under MCL 257.698(4). See the full underglow laws page for more.
Light Bars & LED Lighting
Status: Conditional
Michigan is notably strict here — it's one of the few states that genuinely requires physical covers on non-compliant lighting. Any lamp that isn't expressly required or permitted, and doesn't meet the federal lighting standard under 49 CFR 571.108, must be both covered and unlit while on the highway.
Front-facing auxiliary lighting colors are limited to white or amber. A cover is required for any non-compliant lamp. This is regulated under MCL 257.698(4). Learn more on the light bars & LED lighting laws page.
Wheel & Tire Protrusion
Status: Legal
Good news for enthusiasts running wider setups: Michigan has no statute requiring fenders, mud flaps, or splash guards, and there is no rule limiting how far a tire may extend beyond the fender line. The only restriction that applies is the state's general 8-foot-6-inch overall width cap.
More details are available on the wheel & tire protrusion laws page.
Window Banners
Status: Conditional
Michigan's rules here are stricter than many drivers assume. Tinted film is allowed along the top edge, but no more than 4 inches from the top or below the factory shade band, whichever is closer to the top. Because the material used in this zone must be transparent, a printed or opaque banner is not legal in Michigan — only a clear tint band is permitted. A windshield strip is allowed, subject to the same 4-inch/shade-band placement rule.
The banner (tint band) must be non-reflective and limited to the top 4 inches of the windshield, or the area above the AS1 line if one is marked. This is covered under MCL 257.709. Full details are on the window banners laws page.
Headlight & Taillight Tint
Status: Illegal
Smoked or tinted film on headlights and taillights is flatly illegal in Michigan. Headlights must emit white light, and taillights must show red light at the required visibility distance. Any tinting, covering, or alteration that reduces light output or visibility violates the law — Michigan prohibits this outright, with no film permitted on either lamp type.
This is enforced under MCL 257.685 and MCL 257.686. See the headlight & taillight tint laws page for the full picture.
License Plate Frames
Status: Conditional
Plate frames themselves are allowed in Michigan, and covers are not expressly banned — but nothing that's legally required on the plate may be hidden. The plate must remain free from foreign materials that obscure registration information and must stay clearly legible.
Specifically, frames and covers must not obstruct, cover, or obscure any portion of the plate, including the registration numbers, letters, or validation tabs. Tinted or colored covers that impair visibility are prohibited. This falls under MCL 257.225(2). More on the license plate frames laws page.
Exhaust Noise
Status: Conditional
Michigan is one of the more precise states when it comes to exhaust noise — the law sets actual decibel limits rather than a vague "excessive noise" standard alone. For passenger cars, the limit is 76 dBA at 35 mph or less and 82 dBA above that speed, measured at 50 feet. There's also a stationary run-up limit of 95 dBA measured 20 inches from the tailpipe.
Other vehicle classes differ: heavy vehicles are capped at 86/90 dBA, and motorcycles at 82/86 dBA (using the same low-speed/high-speed structure).
Exceptions and standards to know: the maximum of 95 dB is measured at 20 inches from the exhaust outlet at engine speeds producing maximum noise; exhaust systems must not bypass original equipment mufflers; and open headers, straight pipes, and gutted mufflers are all prohibited. This is governed by MCL 257.707c. Full specifics on the exhaust noise laws page.
Window Tint
Status: Conditional
Michigan's window tint law splits by window position. Front side windows may only be tinted on the top 4 inches. Rear side windows and the back window may be tinted to any darkness.
This is codified under MCL 257.709. Visit the window tint laws page for complete details.
Lift Kits
Status: Conditional
Michigan caps bumper height rather than regulating lift height directly. Cars are capped at a maximum bumper height of 22 inches, while trucks are capped between 26–30 inches depending on GVWR (weight class). Related frame-height and lift-block limits also apply.
This falls under MCL 257.710c — the same statute governing lowering. Check the lift kits laws page for more.
Aftermarket Exhaust
Status: Conditional
Swapping your exhaust system is legal in Michigan, but a muffler in good working order is required, and cutouts or bypasses are prohibited. Notably, there is no statutory "no louder than stock" rule — instead, the standard is that the exhaust must not produce excessive or unusual noise under normal operating conditions.
Key requirements: the exhaust system must include a muffler and stay within reasonable noise levels; catalytic converters are required on vehicles originally equipped with them (removal is also prohibited under federal law); and cutouts, bypasses, or similar devices that let exhaust exit before the muffler are not allowed.
This is governed by MCL 257.707, with related provisions in 257.707a–707c. See the aftermarket exhaust laws page for the complete rules.
Every modification above links to its full law page with exact limits, statute citations, and exceptions — or browse every Michigan mod law in one place, free.
Disclaimer: This guide is for informational purposes only. Data is AI-extracted from public statutes and may contain errors. Always verify with local authorities.