yeah, coz the n15 was built in japan, they dont make radio's with the same FM freq's that we use, so the car comes over with no headunit in, and the dealer fits them, so it depends which dealer fitted it really, thats why they all dont have the same HU in, some have clarion one's in instead
same at my factory, if we build a japanese car, we dont fit a headunit, actually, theres a few countrys that dont get one, but reckon thats just coz theyre third world countrys and dont have radios lol