Magnaflow, Catco and Carsound are all made by the same supplier. I think the only difference is the pipe portion, not the cat body. You should just swap it for the Catco like Summit offered. I've ran 2 different brand cats on my 96 SS with Pacesetter longtube headers and there was no problem. This way, your bung won't need to be tapped!
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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