It really only becomes an issue if something goes amiss with the audio system and you try to get the dealership to address it. If they can see any evidence of alterations, you "might" be in for an argument depending upon your relationship with the service manager.....I've seen and experienced first hand what happens when a dealership points to an aftermarket part and tries to make a claim that because of the "unauthorized replacement or modification" of a particular part, the warranty is void. My example of the cool air intake actually happened and is actually part of the car manufacturer's write up in the car warranty language. You have to look at the language in your car warranty...buried in the fine print. I haven't looked at the Nissan documentation so I dont' know what their disclaimers are. As I said, it's not an issue until something goes amiss, then the dance begins. That's why I don't intend to do any aftermarket mods to this car. I already had an issue with the rear facing DVD players in the headrests. They stopped working and I took it in to the dealership where I bought the dogone thing. The first thing the service manager did was disclaim any responsibility because it was an aftermarket part (this is Nissan service ). I told him that it was a Nissan install and a Nissan part. He disagreed and said Nissan didn't have those in inventory. He left and came back 10 minutes later and told me that he had run the serial number and model and that it was in fact a Nissan install for a loaded LE as recorded in the history of the vehicle....so they agreed to go in and found the power problem and fixed it....but not without my insistence that it wasn't an aftermarket product.
2009 Murano LE, white/tan, 48K miles; with all the amenities you can pack into this thing. Whoever had it first was obviously a doo-dad guy. Can't watch DVD movies because the headrest screens are facing backwards!!