Originally Posted by ec_E92
News flash, valvetronic has cutouts that open/close.
The valve'd exhausts are cutout exhausts. The valve'd systems (Evolve, Gintani, IPE, etc) all have a stock like "civil" setting & then the straight pipe setting. All of these systems still maintain the mufflers & have some backpressure (maintain TQ).
A cutout system basically eliminates the muffler section (assuming you install them post X-pipe). This will be loud as shit because you're eliminating the only remaining resonator (mufflers) with cutouts & you might also lose a small amount of TQ because of the decrease in backpressure
A cutout exhaust also costs ~1/10th of a valvetronic system