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BigBoost’s stage 3-4 turbo for the B58 Gen 1 and 6 Port TU engine! What’s included? BorgWarner EFR 8374, 8474, 9174 or 9280 Cast twin-scroll manifold 40% larger than stock runners and area with external wastegate port. Aviation grade stainless steel oil feed lines Oil feed and return fittings for turbo Oil feed fitting
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