With the new exhaust rules .. 2016 cars can mount 2 o 3 exhaust pipes..
but is louder..? the red-bull vs Renault with the same engine v6 sounding on track

Slowmotion 240fps + pure sound!

[ame="http://www.youtube.com/watch?v=tYGFVmR7-uo"]Formula 1 2016 SOUND! RedBull Vs Renault / 3 exhaust vs Dual Exhaust pipe - YouTube[/ame]