Im sorry Kanibul for the missunderstanding but that is not my point, and that is not what the law says, even that I do understand your point.
Yes the law it has to do with add-ons and any aftermarket part, what the law protect you from is from dealers that take the practice of looking at a mod, and they want to void the warranty of the car.
For example, you can install an oil cooler, and if u have problems with transmission, they cannot look at the car and tell you that your car is out of warranty because you install something that dont belong to the car. Thats when the law protect you, they have to take the car as it is, perform the regular diagnostic AND if after performing the their job they get to a conclusion the problem with the transmission was the oil cooler then they have to put it in writing and charge you whatever.
IF you change ur Wheels, and you have problems with suspensions, they have to take your car and perform their job, then decided if they are going to void warranty or not, and only for the part related not the whole car.
If you install and aftermarket radio, and ur lights don't work, they have to chek the car.
Using your example, if you install Nitrous on your car, yes they can void the warranty if something happen to the engine, but ONLY if something happen. But the law says that they cannot deny you warranty just by looking at the car and see the bottle.
etc. I think u got my point now.
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