I have a similar set up now mid pipe + short tails, injen CAI and will be adding Berk HFCs and Z1 Intake plenum before going for a tune/dyno.
From everything I have gathered Firehawk's results are inline for a Nismo. The Nismo does not benefit as much as a base from the mid-pipe and the largest gains posted on AAM's site are for a base. Which benefits more by getting the H-Pipe that the Nismo already has, and larger diameter piping.
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