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The AEM BMW Cold Air intake system relocates the filter outside of the engine compartment to deliver the coolest air inlet temperatures possible. Tuning the BMW inlet pipe length and diameter to match the BMW's engine's resonance helps move more air to the cylinders and this tuning allows AEM to deliver the maximum power gains throughout the entire RPM range. AEM also monitors BMW fuel trim correction factors and all OBDII sensors during R&D to eliminate leaning the engine out and/or throwing a check engine light.
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