Magnaflow XL 3 Chamber Mufflers use a unique combination of large diameter perforated tubing and strategically placed sound baffles to reduce unwanted resonance and help your engine create horsepower. The sound baffles tune the sound waves using calibrated tuning gate openings that allow portions of the waves to pass through. The large diameter perforated core eliminates the flow restrictions of a louvered style core. This product ships in approximately 1 days