If your going to go SC you will want to keep the HCF. The reason for this is, if the exhaust it too free flowing you will lose Boost pressure with a Supercharger setup. I when was using Berk HFc's switched back to stock cats and gained 2.5 PSI and 30Whp/Tq.
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2011 Brilliant Silver NISMO 370z. #: 0046.
PPE LTH | MillSpec Cats | F.I Exhaust | Akuma Intakes | Rotora 6/4 Brakes
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