Been thinkin on that issue myself Rusty. A guy COULD buy 2 sets and rig it up so 1 set closes and the other opens. A little cutting and welding ............not that hard. BUT, the cut outs in the exhaust side would be restrictive when the loud side is opened up. OR.......
Some genius needs to invent a sort of "U" pipe that bolts to the headers, with a blade that just goes back and forth, from the open side to the exhaust side. Doesn't really sound that difficult to engineer if you're already making electric cutouts.