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I had issues with that muffler. It definitely quieted things down and for that I really liked it. I had restriction problems as it takes 2, 3” inlets and goes down to a dual Y - effectively making it a single 3” in the center. I spoke to an engineer at Magnaflow as I was a bit confused by why they would do this. He sent me the CAD drawings that confirmed the diameter of the piping inside and that it wasn’t suited for our application but it would muffle sound if you have sound restrictions. Ultimately I went with the GESI high flow cats, MRBP resonators and it took a lot of the edge off. For track days at sound restricted tracks - like Laguna - I had Laguna pipes made with a insertable resonator to further reduce noise if I need to. (Sometimes the fog/humidity in the air will cause sound to reverb around the sound booth louder).
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