Essentially the issue you'll run into is your current HFCs have a different flange from the flange on the headers, so they won't fit with the Z1 headers, which were designed for the 350z. You'll either need to buy a header designed for the 370z, or buy a cat-section that was designed for the 350z and pair it with the momentum/z1 headers.
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2014 370z Touring Sport Magma Red MT // BP Single Turbo 6467 // 63mm TB's // Z1 Ported Upper Mani // RJM Pedal // Zspeed Stage 3 Clutch // 526 WHP, 451 WTQ
2006 350z (Sold) // 1990 300zx (Sold) // 1985 300zx 2+2 (Sold)
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