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A larger BorgWarner turbo from the S400SX line takes care of the low-pressure stage. The large-frame S400 is known for its great flow characteristics and rugged durability in the aftermarket (often referred to as an S480 when equipped with an 80mm compressor wheel). The S400SX also features BorgWarner’s extended-tip compressor wheel technology (for a broader compressor map) but utilizes a cast-aluminum wheel with an 80.3mm inducer. Its ultra-high-flow, 96mm (inducer) turbine wheel is the largest offered in this 1.32 A/R, non-wastegated turbine housing. On its own, this particular S480 will flow 120 pounds of air per minute (approximately 1,700 cfm).