Complete Guide to Vehicle Modification Laws in Ohio
Ohio enthusiasts have a lot of room to customize their rides, but several modifications come with specific legal limits worth understanding before you start wrenching. This guide breaks down the most common modifications — from suspension changes to window tint — using figures verified against primary statute text (August 2026). Read on before you drop your ride, tint your windows, or wire up underglow.
Lowering
Status: Conditional
Ohio does restrict how low you can go. The core rules: the body or chassis may not contact the ground, the fuel tank may not be exposed to damage from collision, and no part of the original suspension may be disconnected to defeat safe operation. Wheels may not contact the body in normal operation.
Where bumpers are lowered or modified, height is measured to the bottom of the frame rail, and the maximums are 22 inches for cars and, by GVWR, 24/26, 27/29, or 28/31 inches for front/rear on other vehicles.
Exceptions & exemptions: Keep the body and chassis clear of the ground, protect the fuel tank from collision exposure, and leave the original suspension connected.
This is governed under Ohio Rev. Code § 4513.021(D) and OAC 4501-43-04(D). See the full lowering laws page for details.
Lift Kits
Status: Conditional
Lift kits are permitted in Ohio, but bumper height is capped. Passenger cars are limited to a 22 inch maximum bumper height, while other vehicles are capped between 24–31 inches, depending on GVWR.
This falls under Ohio Rev. Code § 4513.021 and OAC 4501-43-04. Check the lift kit laws page for the full breakdown by vehicle weight class.
Wheel & Tire Protrusion
Status: Legal
Good news for fans of aggressive wheel fitment: Ohio has no fender-coverage or protrusion rule for passenger cars. There's no stated protrusion limit in the statute.
This is addressed under Ohio Rev. Code § 5577.11. Visit the wheel & tire protrusion laws page for more.
Underglow
Status: Conditional
Underglow lighting is legal in Ohio, including while driving, but it comes with color and behavior restrictions. Lights may not flash, rotate, or oscillate, and auxiliary lamps are capped at 300 candlepower with aiming limits.
Exceptions & exemptions: Underglow cannot be red or blue, since those colors are reserved for emergency vehicles. Lights must not be visible while driving in a way that creates distraction, and static white or amber underglow is generally acceptable when parked.
This is governed under Ohio Rev. Code § 4513.17. See the underglow laws page for full details.
Headlight & Taillight Tint
Status: Illegal
Smoked or tinted film on headlights and taillights is not allowed in Ohio. Film of any kind is not permitted. Headlights must emit white light and taillights must show red at the required visibility distance — tint that dims or discolors either violates these requirements.
Exceptions & exemptions: Headlights must emit white or amber light and cannot be covered with any material that changes their color or reduces light output.
This falls under Ohio Rev. Code §§ 4513.04, 4513.05, and 4513.15. Full info is on the headlight & taillight tint laws page.
Window Banners
Status: Conditional
Material along the top of the windshield is unregulated in Ohio as long as it does not extend below the AS-1 line or 5 inches from the top, whichever is closer to the top. A printed banner can be legal as long as it stays within that strip.
Exceptions & exemptions: The banner must not exceed 5 inches from the top of the windshield or extend below the AS-1 line where present, and it must not obstruct the driver's view.
This is covered under Ohio Rev. Code § 4513.241 and Ohio Adm. Code 4501-41-03. See the window banner laws page for the specifics.
Light Bars & LED Lighting
Status: Conditional
Ohio doesn't require light bars to be covered, but it does cap how many can be lit at once. Where a vehicle has auxiliary or spot lamps, or any front lamp over 300 candlepower, no more than five may be lit at one time on a highway — Ohio's cap is notably five lamps rather than the four used in most states. Aiming is governed by a 75 ft rule.
This is addressed under Ohio Rev. Code § 4513.17 and Ohio Adm. Code 4501-15-06. Visit the light bar & LED lighting laws page for more.
Window Tint
Status: Conditional
Ohio's tint law differs by window position. Front side windows require a minimum of 50% VLT. Rear side windows and the back window may be any darkness.
Exceptions & exemptions: If you tint the rear windows to any darkness, you're required to have exterior mirrors on both sides of the vehicle.
This falls under Ohio Rev. Code § 4513.241 and Ohio Admin. Code 4501-41-03. See the window tint laws page for full details.
Exhaust Noise
Status: Conditional
Ohio does not set a statewide decibel limit for passenger cars — there's no numeric cap on the books. That said, a muffler in good working order is required, exhaust may not produce excessive or unusual noise, and cutouts or bypasses are prohibited.
This is governed under Ohio Rev. Code § 4513.22. See the exhaust noise laws page for more.
License Plate Frames
Status: Conditional
License plate frames themselves aren't specifically mentioned in Ohio law, and they're lawful as long as they don't obstruct the plate. The plate must be displayed in plain view, and covers are banned where they obstruct visibility of the plate, any county identification sticker, or any validation sticker.
Exceptions & exemptions: Frames are permitted as long as they don't obscure any portion of the plate, including numbers, letters, validation stickers, or state identification. Covers or anything else that obscures the plate is prohibited.
This falls under Ohio Rev. Code § 4503.21. Full details are on the license plate frame laws page.
Aftermarket Exhaust
Status: Conditional
Swapping out your factory exhaust system is legal in Ohio. A muffler in good working order is required, and cutouts or bypasses are prohibited. There's no statutory "no louder than stock" rule — instead, the standard is that the exhaust must not produce excessive or unusual noise. Note that catalytic converter removal is prohibited under federal law regardless of state statute.
This is governed under Ohio Rev. Code § 4513.22. Check the aftermarket exhaust laws page for more.
Every modification above links to its full law page with exact limits, statute citations, and exceptions — or browse every Ohio 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.