After seeing the video of the Lexus F-Sport exhaust system, I did some research into the other performance accessories offered in the line.
Lo and behold, I found a very extensive video of the F-Sport air intake being installed and tested (along with a Tanabe exhaust system):
In terms of sound, it’s hard to determine what’s caused by the air intake as opposed to the replacement exhaust system, but two of them together is a winning combination.