After seeing it in action on the Corvette I thought is as a nice way to have a nice civilized sound and then be able to uncork it when needed. It would seem like you could keep some low end torque/back pressure, but then gain top end when the system opens up. I did some checking and can't seem to find any use by Asian ricers. Just German cars, the Corvette, and GTO's from the late 60's.