No resonators. Has high flow cats. I asked Rob to custom make up a partial crossover pipe for a free flow. A true crossover pipe (usually called a X-pipe) forces the exhaust from each side of the engine to be forced into a single 2 1/2" X- joint and then changes back to a dual exhaust. An X may be a good thing for a N/A engine for the needed back pressure but I didn't feel a supercharged engine needed the added flow resistance of a true X. The rear mufflers are Moroso Spiral Flow with trim rings Rob made up. Squirrel Crusher