anything that may potentially endanger the driver, the vehicle or the vehicles around you, things like installing nitrous oxide tanks, a turbo, sometimes removing ABS brakesthing as changing brakes, tuning and recalibrating the suspension are normally ok, read your auto-insurance contract before making any modifications

True. Your auto application specifically asks if the vehicle has been modified in any way. If you say no, then that's called "material misrepresentation" and voids the policy.You CAN buy extra coverage for customized equipment, called, "customizing equipment", amusingly enough. The premium is added to your collision and comprehensive coverage costs.

All modifications are different. You can insure those modifications. When you finish modifying, take the car to your agent and ask "how much to insure this now?". Be prepared to dig deep into your pockets, cause it won't be cheap.

anything that adds more value to you car raises your auto insurance if is reported…why the reason why is because if the car is lost or something happen they have to pay it to you back!!

thanks Source(s): http://www.insurance.2arz.com