Eric,
Here is a clip of the first start of mine, 3.2 w/SSI's, on a car I sold. I don't know enough about the true sound of the R, but I loved that muffler. I regret having let it go, to the point that I'm having Brian make me another right now for my current car. Good luck with your search!
https://youtu.be/9ymrvSSthlw