This unit is 3.5" and increases the volume of air that the engine can take in, increasing horsepower... It will directly fit onto the Euro Air Box but will require an adaptor or european-spec intake kit to fit on the US spec cars (m50, m52, S50us, S52us). This sensor has a greater reading range for airflow than even the euro or 540 HFM, making it perfect for your very high HP / boosted project.
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