Milltek Valvesonic Preview

[IanCH]

It's on demand. Flip a switch to go from quiet to not quiet. It energizes/de-energizes a solenoid valve in the exhaust plumbing thereby routing the exhaust gases through a more or less muffled pathway.

Nice, I was expecting some kind of automatic solution but in all honesty a flip of the switch sounds better for anyone who would be in the market for this (enthusiast)

[MilltekSportUSA]

This system has a control module that ties into the vehicle's CAN bus system. The valves open and close at programmable RPM points. There is also a manual operation switch that gets mounted in the cockpit.