Originally posted by Khuang:
The factory has to prove that the damage was caused by the aftermarket component.
You didn't call Acura like I asked, did you?
Let me put it another way. I know for a fact that American Honda has refused to pay for the repair of multiple blown NSX engines where the car was still under warranty because the cars were lightly modified.
To give some examples of how minor a mod can be to cause a warranty repair to be denied, I am talking about something as simple as aftermarket air filter in one case and aftermarket tires in another case. Yes, tires. Both NSXs had trashed engines and the cars were under warranty, but Honda refused to pay based on those "minor" mods. Was Honda right to deny those warranty claims? That's an entirely different thread. The point is: the owners were stuck with the bill.
Honda doesn't have to prove anything to deny the claim, they just have to decide to deny it. The only time they have to prove anything is if you can afford to fight them in court at a cost that will probably dwarf any NSX repair bill.
Here is how it really works. The factory service rep makes a determination on whether to cover repair on a modified car under warranty based on the case.
If the case is that you installed a shift knob and your differential blew up, they would certainly cover it. If the case is that you blew an engine on a supercharged car, I can guarantee that they would not. In fact if you install sway bars and A032R tires and suffer oil starvation and blow your engine, they will not pay.
Can you lie and/or put the car back to stock to get it covered? Sure, it's called fraud, the same as if you burn down a building to collect the insurance.
Can you fight them in court? You can try, but when you arguing this case in front of a judge or jury you are going to have your opinion vs. their enormous amounts engineering data and expert testimony and testing showing that the parts were designed to work in a specific way, under specific loads, etc.
They are very unlikely to settle such a case because 1) they konw know they have the upper hand and 2) they know it will cost you more to fight them than to pay the repair and 3) it would set a very bad precident.
I am not trying to say "don't modify your car" - I have owned two heavily modified NSXs and the current one is still under the original factory warranty. But I also want to make sure anyone else doing so goes into it with a proper understanding of the full implications of modifying a warrantied car.
Again, I refer anyone interested to the Acura customer service department. This is my last post on the topic.