What are the laws about automotive modifications?

In New Hampshire, there are laws about automotive modifications that must be followed. The vehicles must stay within certain limits in order to be considered safe and legal. Vehicles must maintain a reasonable noise level and have a valid exhaust system that has been approved by the Department of Environmental Services. This exhaust system must have a tailpipe that is of the right size and must not be modified to a different type of muffler or pipe. All after-market modifications must be inspected and approved by a licensed mechanic from the Department of Safety. In addition, the state of New Hampshire requires that all lights that are used on a vehicle must be DOT (Department of Transportation) approved. This includes headlights, rear lights, and brake lights. Any modification or addition of lighting must be properly secured, and any modifications to the vehicles suspension or engine must be certified by a licensed mechanic. Lastly, vehicles must remain street legal in the state of New Hampshire no matter what type of modifications are made. All of the modifications must be done in a manner that does not create a safety hazard and must comply with all state and federal laws. Automotive modifications must also meet all applicable emission standards set by the state in order to be legal. By following these laws, anyone who wishes to make modifications to their vehicle can be sure that they will be safe and legal.

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What are the laws about automotive modifications?

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