I am not sure for overseas, but you can't void your warranty entirely by adding an aftermarket part. If you radio goes bad Nissan can't deny your warranty claim due to having headers installed on your car. It has to be a direct failure of the part due to the aftermarket part. So if you MAF sensor goes out and you have CAI installed it will be a little tougher to get the MAF covered under warranty. You will have to pay out of pocket and prove that the CAI didn't mess up the MAF. Hope that helps a little.
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