But as soon as you push the trick exhaust button the butterfly valves open and it just sounds incredible. (carwale.com)
When the valved exhaust is «open» (on start - up, high load or with the little exhaust button pressed) the titanium system is effectively straight through from the short manifolds, and the colossally deep boom that erupts dominates the area around the car. (evo.co.uk)
Hit the active exhaust button on the center console, and you can... (autoweek.com)