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Is this the first time you've taken the new exhaust to redline? Maybe you just need to get used to the sound?
A blown out cat is a little loud, you still have a muffler, an exhaust leak is very loud. I've blown through a couple of cats with my Rx-7 and the car does get louder, but it's gradual and still not exhaust leak loud.
I'm sure you've done it already, but recheck the exhaust system for leaks and retorque your bolts. Maybe you need new gaskets or have a warped flange that only shows up when the pipes are hot. Chances are it's not the cat.
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