It's not entirely stock sound, it's the stock sound but implemented into Bartek's special sound system (it's actually a big difference). Also It's very debatable whether it should use the NSX sound or not. Unlike the Infernus, NSX is not a super car. I made this decision as a little easter egg thing.
![[Image: oJ6eTtU.gif]](http://i.imgur.com/oJ6eTtU.gif)