Legality Guides
How Dark Can Your Window Tint Be in the UK?
The front glass has a hard legal limit; the rear has none. Here is exactly how dark you can go, and where most aftermarket film crosses the line.
Will a Decat Downpipe Fail an MOT?
A decat removes the catalytic converter, and the MOT looks for it directly. On a car built with a cat, a decat is a straight fail and is not road-legal.
What the MOT Checks on a Modified Car
The MOT is the UK’s annual roadworthiness test. It won’t fail you for modifying a car, but it does check the things mods most often affect.
EU-kontroll: Norway’s Periodic Check and Your Modifications
EU-kontroll is Norway’s periodic roadworthiness test. Norway is strict on modifications: many changes need approval before they are legal, not just at the test.
APK: The Dutch Periodic Inspection and Your Modifications
The APK is the Netherlands’ periodic roadworthiness test. A modified car can pass, but Dutch rules are firm on tint, exhaust noise and emissions.
Do US Car Inspections Cover Modifications?
The US has no single national test. Whether an inspection touches your mods depends entirely on your state, and emissions is where it bites hardest.
What CARB Approval (an EO Number) Means for Your Mods
In California and the states that follow it, a performance part often needs a CARB Executive Order to be street-legal. Here is what that number is and why it decides so much.
What You Must Carry in Your Car in Germany
Germany requires three things in every car: a first aid kit, a warning triangle and a high-vis vest. Here is exactly what the law says, what each item must meet, and what missing one costs.
What You Must Carry in Your Car in Norway
Norway requires two things in every car: a warning triangle and a reflective vest within reach of the driver. Here is what the regulations actually say, the 500-kroner detail, and the winter rules that come on top.
What You Must Carry in Your Car in France
Crossing to France this summer? Two items are legally required in every car, one famous requirement was scrapped in 2020, and UK-registered cars have a short extra list. Here is what French law actually asks for.
Portable CarPlay Screens: Are They Legal on Your Dash?
Standalone CarPlay and Android Auto screens have become the quick way to modernize an older car. They are legal to use in the US, but where you mount one decides whether you stay legal.
Backup Camera Law and Retrofitting One to an Older Car
Every new car sold in the US since mid-2018 has a backup camera by law. Older cars are under no obligation to catch up, but retrofitting one is cheap and well within DIY reach.
Window Tint Laws in the US: How VLT Limits Work
Tint darkness in the US is set state by state and measured as a percentage of light passing through the glass. Here is how the rules are built, and what gets checked at the roadside.
Lift Kits and Vehicle Height Laws in the US
There is no federal lift limit. What actually caps how high you can go is your state's bumper or frame height rule, plus the equipment law that comes with it.
How Low Can You Legally Lower a Car in the US?
Lowering a car is legal across the US, but how low you can go is set by your state, and by the equipment height rules that a big drop quietly breaks.
EPA Tampering Rules: What Federal Law Actually Bans
Federal law says nothing about lowering springs or a louder exhaust. It says one very specific thing about emissions equipment, and that line is the same in every state.