Compliance & Legality
50-State Automotive Legality & Inspection Guide
Look up window tint VLT limits, exhaust noise rules, safety inspection cadence, emissions and OBD-II readiness tolerance, ride height law, and front plate requirements by state.
Loading calculator…
How to Use This Tool
- Pick your state from the dropdown or the state grid.
- Review tint VLT limits, exhaust noise rules, inspection cadence, and emissions requirements side by side.
- Check the review date and follow the source link to confirm the current statute with your state agency.
- Use the shop cross-link to find inspection and dyno facilities in your state.
The Formula & Physics Behind the Math
Window tint is regulated by visible light transmission (VLT), the percentage of light that passes through the glass and film together. A 70% VLT limit permits only very light film, while 20% is a dark aftermarket tint. Because factory glass already absorbs some light, installers measure the combined result with a VLT meter rather than relying on the film's rated percentage. Emissions programs read OBD-II readiness monitors, the self-tests a vehicle runs on its emissions systems; a monitor still reporting 'not ready' after a battery disconnect or code clear can fail an otherwise healthy car, and states differ in how many incomplete monitors they tolerate.
Frequently Asked Questions
What is the legal window tint percentage in my state?
Limits are expressed as minimum visible light transmission on front side windows and range from 70% in states like California, New York, and Pennsylvania down to 20–25% in states like New Mexico, Texas, Arkansas, and Oklahoma. A few states including New Jersey, New Hampshire, and Vermont prohibit aftermarket film on front side windows entirely. Select your state above for the full breakdown including rear glass and windshield strip rules.
Is a muffler delete or exhaust cutout legal?
No state permits removing the muffler from a vehicle that was originally equipped with one. Every state requires a functioning muffler and prohibits cutouts or bypasses. Some states set a numeric decibel ceiling — California enforces 95 dB under the SAE J1492 test — while most use a subjective 'excessive or unusual noise' standard that leaves the call to the officer.
Can I pass emissions with OBD-II monitors not ready?
It depends on the state. New York allows two incomplete readiness monitors on 1996–2000 model years and one on 2001 and newer. Most other OBD-II programs accept no incomplete monitors at all. If you recently cleared codes or disconnected the battery, drive a full drive cycle to set the monitors before testing.
Which states require a front license plate?
Thirty states plus the District of Columbia require two plates. Twenty states are rear-plate only: Alabama, Arizona, Arkansas, Delaware, Florida, Georgia, Indiana, Kansas, Kentucky, Louisiana, Michigan, Mississippi, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, and West Virginia. Ohio became rear-only in July 2020.
Which states have no safety inspection?
More than half of all states have no periodic safety inspection for personal vehicles. Texas ended annual safety inspections for non-commercial vehicles on January 1, 2025, replacing them with a fee collected at registration. States that still inspect annually include New York, Pennsylvania, Virginia, North Carolina, Massachusetts, New Hampshire, Vermont, Maine, Hawaii, Louisiana, and West Virginia.
Do aftermarket parts need CARB approval?
In California, emissions-related aftermarket parts must carry a CARB Executive Order (EO) number to be street legal, and a smog check can fail on a non-EO intake, header, or catalytic converter. States that have adopted California emissions standards — including New York, New Jersey, Vermont, and Washington — may apply similar rules to new vehicle sales and inspections.