Honestly OP you should just order a better mid-pipe instead of messing with the cats. I'm pretty sure the mid-pipe will combine with the short tails would be a nice set up instead of messing with the cats. I'm actually ordering the AAM mid-pipe soon to combine with my short tails. No matter what you replace the stock cats with you are going to get some hiss and A LOT of noise from my experience.
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2015 370z Nismo l AAM Resonated Short Tails l AAM Mid-Pipe l Motordyne ART Test Pipe l BC/DR Coils w/Swift Springs l Forgestar l SPL
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