I love music, but sometimes, exhaust notes sound just as good. Here are a few videos for your listening pleasure! You're going to want to turn up the volume.
From 19bozzy92, this video, called "Loudest & Best Sounding Porsche 997 GT3 Cup MK1 I've ever heard on Hillclimb!!", is pure music!
from user Speed Infinity, this video is called "Porsche 997 GT3 Rally / Racing Amazing Pure Sound"
From user HistoricRacingHD, this Mazda makes amazing 4-rotor sounds!
And finally, from 19bozzy92, volume 6 of his "Best Car Sounds" video series.