Switchable exhausts?

[robsco]

Is this viable? My old Cerb made a noise that would wake the dead, and an unholy overrun. The Tuscan is at the moment decatted with standard cans, and there's not enough volume. Pops and bangs are at too much of a premium too as it stands. That said, despite the laugh-out-loud hooliganism of a ridiculously noisy exhaust set-up, sometimes it's nice to settle down for a bit. Leading to the question... Has anybody on here tried this? Is it a possibility or are there factors to displace the theory?