The new VT muffler will be a self adjusting flow depending on the psi, or exhaust flow at any specific drive cycle. This muffler will have a open valve at the higher rpm ranges allowing for a free flowing system, but at the lower rpm's the valve will be more closed to cerate the needed back pressure to eliminate exhaust turbulence (drone) and will have a mellower tone during this time. I have included the chart of the current units available
That sounds pretty neat. I think our Nissan Maxima has a similar muffler. I would like to hear some you tube clips or hear what others have to say that have it on their car.
Sounds(pardon the pun) like a neat idea but I would not want them on a car with a turbo or supercharger due to the valve closing and making backpressure.