Yes. I was surprised because the only advertised changes were the new door panels and the one year only colors-Arctic Blue Metallic and Magnetic Black. Nothing else in press releases spoke of any NVH improvements. So I poked around my truck, along with the Master Tech at the Nissan Dealer I frequent (He was curious as well, as he had driven several Titans over the years, and made the comment the 2015's seem alot quieter than others). Here is what we found:
-Using Nissan's weatherstripping test from the FSM for technicians (basically measuring tolerances between door jams, alignment of doors and the "dollar bill" test on the tightness of the weatherstripping) we found that my 2015 had significantly tighter gaps. More even spacing between all gaps from front fenders to front doors, from rear of front doors to back swing out doors, and more weatherstripping "squeeze out" when the doors are shut. The weatherstripping is also significantly tighter. He could barley pull the dollar bill through. So either mine has just straight up better fit and finish vs. my 2014, or the weatherstripping got thicker (although he was still showing the same part numbers for it vs. the 2014) or a combination of the two. Either way, the truck has a lot less wind noise than before. If Nissan would have just used Acoustic Laminated Glass in the front windshield and doors, I feel it would rival the current GMC Sierra in measured Sones (or db), which has been mentioned in some truck tests (when the re-design came out in 2014) as being the quietest truck currently on the market. I test drove one, and indeed it's damn near "luxury car quiet". I have since had my frame coated, rustproofing wax in the door jabs, and undercoating on the underside panels. All I hear is wind noise over my Big Tow mirrors and my factory big shield. At some point when I do the audio, I will apply Hushmat and 1/4" foam in the cab. The it will really be quiet.
-Inside the front fenders, the acoustic felt lining was approx. 1/8" thicker vs. my 2014. Now whether that was because it was brand new and not "aged" or it is in fact just plain thicker, we don't know.
-The same materiel that the factory spray on bed-liner is was applied at the factory (in gray, not black like the bed) in the inner rear fender wells, along the under side of the bed near the frame rails down both sides to the cab and underneath about 60% of the entire cab. My 2014 had this only on the inner rear fender wells. Two things could have happened here:
1. A worker in Canton showed up the day they were doing my truck high as a kite and just let loose with the spray gun with that stuff or
2. My 2014 was not sprayed correctly.
These are the only three things that stood out vs. my 2014 PRO-4X as far as possible improvements made to make it quieter.