Yet an other awesome STI, I can't decide if the Tomei or the Invidia sounds better...

Alfa Romeo Giulia Quadrifoglio

Italian V6 at it's best with Pogea Racing exhaust.

Hyundai i30N Fastback

This car sounds so good despite of Euro 6 regulations.

This is an other brutal STI with Blitz Nur spec Perrin catted downpipe.

This is the best boxer engine sound, no doubts!

While I'm more of a boxer engine fan, I'm posting this Viper first because it's clearly the most brutal exhaust sound I've ever heard!