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2. The first upgrade to be installed is the Corsa exhaust system. We’ve been a fan of their quality and performance for a number of years. Rather than flow-reducing bends in the exhaust path to reduce sound levels, the Corsa muffler has a straight-path design, with a series of carefully sized and located channels on both sides of the flow tube. An air gap at the front of flow tube allows targeted waves to enter the channels, which are then reflected back to the gap 180 degrees out of phase, effectively canceling noise. More importantly, the design cancels the “drone” that can make many aftermarket exhausts unpleasant on the highway.