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An exhaust system for an internal combustion engine having two banks of cylinders by which pulses of exhaust gas are alternately directed to a diverter subassembly. The diverter subassembly, which is located in the muffler, includes a perforated gas decelerator chamber which divides each pulse of ex

An exhaust system for an internal combustion engine having two banks of cylinders by which pulses of exhaust gas are alternately directed to a diverter subassembly. The diverter subassembly, which is located in the muffler, includes a perforated gas decelerator chamber which divides each pulse of exhaust gas between two exhaust outlets and causes a low pressure wave to occur in the exhaust system to enhance scavenging of a subsequent pulse of exhaust gas and thereby improve engine performance and mileage. The muffler further includes one or more cores and may or may not include a dead air space chamber to provide attenuation and tonal balance to the exiting exhaust gas.

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1. An exhaust system for a multi-cylinder engine, the system comprising:a plurality of exhaust ports, each in communication with a cylinder of the engine to discharge a pulse of exhaust gas; a plurality of primary exhaust pipes, each having an inlet end and an outlet end, wherein the inlet end is co

1. An exhaust system for a multi-cylinder engine, the system comprising:a plurality of exhaust ports, each in communication with a cylinder of the engine to discharge a pulse of exhaust gas; a plurality of primary exhaust pipes, each having an inlet end and an outlet end, wherein the inlet end is connected to one of the plurality of exhaust ports to scavenge the pulse of exhaust gas; two collector chambers, each connected to and in flow communication with at least one outlet end of the plurality of primary exhaust pipes, wherein the two collector chambers alternate in their collection of subsequent discharges of the pulse of exhaust gas from the engine; two secondary exhaust pipes, each connected to and in flow communication with one of the collector chambers; and a muffler housing, wherein the muffler housing encloses: a diverter subassembly, wherein the diverter subassembly comprises: a first inlet pipe and a second inlet pipe connected to and in flow communication with the two secondary exhaust pipes; a gas decelerator chamber connected to and in flow communication with the first and second inlet pipes, wherein the alignment of the first and second inlet pipes directs the pulse of exhaust gas onto a flow splitter in the gas decelerator chamber, wherein the flow splitter is located obliquely to the flow direction of the pulse of exhaust gas and divides the pulse of exhaust gas; and a first outlet pipe and a second outlet pipe connected to and in flow communication with the gas decelerator chamber, wherein the two outlet pipes direct the divided pulse of exhaust gas away from the flow splitter forming a low-pressure zone in the wake of the pulse of exhaust gas, and wherein the low-pressure zone preferentially travels back up the exhaust system as a reflected negative wave to scavenge the subsequent pulse of exhaust gas; a plurality of cores connected to and in flow communication with the first and second outlet pipes, wherein each core is perforated or louvered to swirl the divided pulse of exhaust gas as it travels through each core; a dead air space chamber connected to and in flow communication with the plurality of cores; and a plurality of muffler outlets connected to and in flow communication with the dead air space chamber and configured to expel the exhaust gases out of the muffler housing and into the atmosphere. 2. An exhaust system according to claim 1, wherein the flow splitter has a convex shape and is formed by an inner surface of the gas decelerator chamber.3. The exhaust system according to claim 2, wherein the gas decelerator chamber is perforated.4. The exhaust system according to claim 3, wherein the gas decelerator chamber has substantially an X shape.5. The exhaust system according to claim 3, further comprising a baffle plate located between the diverter subassembly and the plurality of cores, wherein the baffle plate substantially isolates a first chamber formed between the muffler housing and the diverter subassembly from a second chamber formed between the muffler housing and the plurality of cores.6. A muffler for receiving alternating pulses of exhaust gas from a multi-cylinder engine comprising:a housing; a gas decelerator chamber located substantially within the housing, wherein the gas decelerator chamber aligns alternating pulses of exhaust gas onto a flow splitter, wherein the flow splitter divides the alternating pulses of exhaust gas between a first exhaust outlet and a second exhaust outlet, wherein the two exhaust outlets direct the divided pulse of exhaust gas away from the flow splitter, wherein the flow splitter is located obliquely to both flow directions from exhaust inlets, wherein the flow splitter has a convex shape and is formed by an inner surface of the gas decelerator chamber, wherein at least a portion of a surface of the gas decelerator chamber comprises perforations to allow the alternating pulses of exhaust gas to also flow through the surface and into the housing, and wherein the perforations extend along a substantial portion of the length of the gas decelerator chamber; and a plurality of cores located substantially within the housing and connected to and in flow communication with the exhaust outlets, wherein the plurality of cores swirl the divided pulse of exhaust gas. 7. A muffler for receiving alternating pulses of exhaust gas from a multi-cylinder engine comprising:a housing: a gas decelerator chamber located substantially within the housing, wherein the gas decelerator chamber aligns alternating pulses of exhaust gas onto a flow splitter, wherein the flow splitter divides the alternating pulses of exhaust gas between a first exhaust outlet and a second exhaust outlet, wherein the two exhaust outlets direct the divided pulse of exhaust gas away from the flow splitter, wherein at least a portion of a surface of the gas decelerator chamber comprises perforations to allow the alternating pulses of exhaust gas to also flow through the surface and into the housing, and wherein the perforations extend along a substantial portion of the length of the gas decelerator chamber; a plurality of cores located substantially within the housing and connected to and in flow communication with the exhaust outlets, wherein the plurality of cores swirl the divided pulse of exhaust gas; and an insulating material wrapping one or more of the plurality of cores. 8. The muffler according to claim 7, wherein a surface of at least one of the plurality of cores comprises perforations, wherein the perforations allow the divided pulse of exhaust gas to flow through the surface and into the housing.9. The muffler according to claim 8, wherein the perforations are cup-shaped.10. The muffler according to claim 8, wherein the cup-shaped perforations are arranged in helical rows around the surface of at least one of the plurality of cores.11. The muffler according to claim 10, wherein the cup-shaped perforations extend along the length of at least one of the plurality of cores.12. An exhaust system of a multi-cylinder engine, the system comprising:a plurality of exhaust ports which are split between a first group and a second group, wherein the first group and the second group each discharge a pulse of exhaust gas from the engine; a muffler, wherein the muffler comprises: a housing, a diverter subassembly located substantially in the housing and comprising a perforated gas decelerator chamber, wherein the diverter subassembly aligns the pulse of exhaust gas from the first group and the second group onto a flow splitter in the perforated gas decelerator chamber, wherein the flow splitter is located obliquely to the direction of exhaust gas flow so as to distribute the pulse of exhaust gas between a first exhaust outlet and a second exhaust outlet, and a plurality of cores located substantially in the housing and connected to and in flow communication with the first and second exhaust outlets, wherein each core comprises perforations configured to swirl the distributed pulse of exhaust gas as it travels through each core, wherein the perforations are cup-shaped; and a baffle plate located between the diverter subassembly and the plurality of cores, wherein the baffle plate substantially isolates a first chamber formed between the muffler housing and the diverter subassembly from a second chamber formed between the muffler housing and the plurality of cores. 13. The exhaust system according to claim 12, wherein the cup-shaped perforations are arranged in helical rows around the surface of at least one of the plurality of cores.14. A method of manufacturing a muffler for a multi-cylinder engine, the method comprising:connecting a diverter subassembly to a plurality of cores, wherein the diverter subassembly is substantially perforated and has two inlet pipes and two outlet pipes, wherein each inlet pipe is aligned to direct a pulse of exhaust gas onto a flow splitter, wherein the flow splitter is located obliquely to the flow direction of the pulse of exhaust gas and divides the pulse of exhaust gas between the two outlet pipes, wherein the two outlet pipes direct the divided pulse of exhaust gas away from the flow splitter and into the plurality of cores, wherein the plurality of cores are perforated to swirl the divided pulse of exhaust gas; connecting the plurality of cores to a dead air space chamber, wherein the dead air space chamber forms a common manifold for the divided pulse of exhaust gas; and installing the gas decelerator chamber, the plurality of cores, and the dead air pace chamber within a muffler housing. 15. The method of manufacturing a muffler according to claim 14, further comprising inserting a baffle plate between the diverter subassembly and the plurality of cores, wherein the baffle plate substantially isolates a first chamber formed between the muffler housing and the diverter subassembly from a second chamber formed between the muffler housing and the plurality of cores.16. A resonator configured to connect with an original equipment manufacturer (OEM) exhaust system and thereby attenuate exhaust noise, the resonator comprising:a housing, wherein the housing connects upstream of an OEM muffler; and a diverter subassembly located substantially within the housing, wherein the diverter subassembly comprises: a first inlet pipe and a second inlet pipe connected to and in flow communication with the OEM exhaust system; a gas decelerator chamber connected to and in flow communication with the first and second inlet pipes, wherein the alignment of the first and second inlet pipes directs the pulse of exhaust gas onto a flow splitter in the gas decelerator chamber, wherein the flow splitter is located obliquely to the flow direction of the pulse of exhaust gas and divides the pulse of exhaust gas; and a first outlet pipe and a second outlet pipe connected to and in flow communication with the gas decelerator chamber, wherein the two outlet pipes direct the divided pulse of exhaust gas away from the flow splitter and to the OEM muffler. 17. The resonator according to claim 16, wherein at least a portion of a surface of the gas decelerator chamber comprises perforations which allow the pulse of exhaust gas to also flow through the surface and into the housing.