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CSF’s front-mount triple-pass heat exchanger for B58/B48-powered BMWs uses a 68mm two-row core with proprietary B-Tube technology and a triple-pass flow that routes coolant through the core three times for lower outlet temperatures. It’s a direct plug-and-play replacement with CNC-machined fittings and mounting pins, fits F-series housings without modification, and includes a detachable rock guard for added protection.
CSF BMW B58/B48 Front Mount Triple-Pass Heat Exchanger w/Rock Guard
