I would have to agree that the prices for exhausts are outrageous, but then again so are all of the aftermarket parts for this specific car (compared to similar sports cars).
The stock NPP however was not doing it for me at all. I went with the Borla S-type and it sounds awesome. None of any of the videos do it any justice, but if you watch some of the higher quality ones on a decent set of speakers with a sub woofer it sounds a little better. Even still, nothing better than both hearing and feeling it in person.
I love how my Borla sounds and feels over stock.
This is one of the better sound clips I've taken of mine because it was taken in 4k high def and mounted right next to the pipe, it's pretty decent on a good speaker, but again, nothing like hearing it in person.
Sound Clip 1
Sound Clip 2