Unfortunately, my 2015 did not have the OEM sport exhaust. I was actually really curious about that exhaust because I wanted to know how it sounded in comparison to the standard exhaust - and whether it would be enough additional sound to satisfy my craving for a little more noise. Similar to you, I generally tend to prefer 'fully stock' but I found the standard exhaust to be a bit too restrictive and wasn't doing the V10 justice. With the amount of labor involved for an exhaust swap, it was hard to make a decision on the sport exhaust without hearing it too much - and I didn't want the car taken apart twice if I still wasn't satisfied, so I was determined to get it right the first time! Ultimately, with the lack of information/availability of the 2015 OEM sport exhaust, I ended up going aftermarket with the Larini. But like you said, an aftermarket control/switch for the valves was a non-starter for me...I wanted something that was "plug and play" that retained all OEM functionality and required no further modification to the car. I have been pretty happy with the Larini - it might be a touch too loud at the limit, but overall it has improved the sound greatly and given the V10 more of an exotic note.
Interestingly, as luck would have it - a 2015 OEM sport exhaust actually popped up for sale in the classifieds here shortly after I had my Larini installed. I still wonder about it sometimes. Would you say you are happy with the sound of your sport exhaust or have you ever considered going aftermarket? Is it 'just enough' boom or do you sometimes find yourself wanting a little more? I wish I would have had the ability to hear one in person to make more of an informed decision.
