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The MMX Performance BMW F1X / F90 S63 Twin Charge-Cooler Set is the definitive cooling upgrade for the S63-powered M5 and M6. The factory air-to-water charge-coolers (one in each airbox of the twin-airbox S63) are notoriously undersized for the engine's output. Drive hard, and intake air temperatures climb rapidly, costing power well before any tuning is in the picture. The MMX set replaces both factory units with engineered upgrades that genuinely transform consistency under load.
Each cooler uses a large tube-and-fin stepped core engineered specifically for the high heat load of the S63's twin airboxes. Per-unit core volume is 28% larger than OE, with approximately double the total cooling area across the pair. The development brief targeted the sweet spot between maximum IAT cooling and minimum pressure loss, meaning the larger size doesn't trade away response or add lag. Internal turbulators improve cooling performance within the core, while cast end tanks maintain clean airflow across it.
The result is a charge-cooler set that doesn't heat-soak. Where the factory units need recovery cool-down between hard pulls, the MMX coolers deliver consistent IATs run after run, exactly what the S63 needs to repeat its quoted output without falling off. The construction also includes an anti-corrosive thermal coating for longevity, and the units are direct-fit replacements that reuse the factory connections, no cutting, no fabrication, no permanent modifications.
Designed and engineered in the UK, and considered essential for every stage of tuning on a high-performance S63 M-car.
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