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single turbo and a cat/cats?

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I'm currently running a 6466 fftec bottom mount kit with an AE quad exhaust. I was wondering if anyone had any ideas on either installing a high flow cat in each of the 2.5" mid pipes or doing a custom single 3 or 3.5" mid pipe with a larger diameter cat

Reason I'd like to put a cat/cats back in is to reduce some of the exhaust noise during light to partial throttle and reduce the amount of exhaust fumes I smell.

o, any opinions on which piping setup, which cat to use, and if you think this is possible while still building for 700ish Whp?

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