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Gutting the cat is more like a bypass than a pre-muffler. I should think that a gutted cat would be much louder than a pre-muffler, and may not flow as well.
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2018 718 Cayman 2.0
Priors - '72 911T coupe, '84 911 Carrera coupe, '84 944, '73 914 2.0
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