I gotta say, I don't know why you go to the trouble of test pipes when you can get virtually the same tone/volume from a good set of HFC's?? I've used them on two Z06's and an 02 Viper GTS, and never looked back. Emissions tests were also a consideration, and all cars were tuned with HP Tuners software.
Not trying to sound like a hater, just wondering why you'd go through the issues associated with removing the cats unless you're building a full on track car.
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