Well if the 2 center resonator's were to leave the car and 2 pieces of pipe moved into their former home

---- this is what might happen ---- exhaust sound would deepen under acceleration

---- going through tight spaces ie; tunnels , canyons would sound louder than the engine noise ---- gas mileage might improve about 1.6 mpg

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Now mind you this is what could happen, we will never say that it has or hasn't