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aFe Twisted Steel Header SS-409 HDR Nissan Frontier/Xterra 05-09 V6-4.0L - afe48-46101 import_2022_03_21_012537 5358cc Fuel Delivery::Fuel Tanks 1966-1967aFe Powers new Twisted Steel header delivers more horsepower and torque while outflowing the factory exhaust manifold. The header is constructed of 14 gauge 409 SS tubing with a 1 2 thick head flange to ensure a leak free seal. To eliminate dead space that can cause turbulence and hindering flow that formed collectors are prone to produce, a true merged collector and optimized tube lengths are used for true pulse control technology improving flow and