I could find nothing in my owners manual ('16 q50 RS400), but if you're a serious shopper, take the USB drive to a dealer and plug it in, no guessing or misinformation, it works or it doesn't.
I love my RS400, fierce engine, and I've owned Germans and Jags in the past. Two universal complaints and I agree: 1) in some regions the RWD models get Dunlop Sport Maxx summer run flats, they stink, negotiate a tire swap, and 2) the exhaust is just too quiet, it need to be replaced. There is pumped in engine sound through two speakers, it can be turned on/off in the service menu, but's artificial and not enough.
I was at my dealer today, they have 3 RS400s, two already have the Infiniti branded Motorsport axelback exhaust installed (I got the first one they ordered, gave up waiting on Stillen). My sales guy said they are selling better with the Motorsport exhaust installed at the dealer, they have one stock car and let folks drive both, the "throatier" (yet not obnoxious) exhaust helps close deals.
Negotiate a tire swap, get the Infiniti Motorsport axelback, or some other aftermarket axelback/catback and you have a serious lux-sport car that can roar and go to a country club.
Here's my Black Obsidian, I had the dealer paint the chrome grill frame the body color, it lowers the front end look..........
