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The High-Flow TriFoam™ triple-layer construction of the filter is simply the best filtration material on the market, and is the key to the power gains achieved. Developed for use in their TDI Volkswagen Racing cars, the system delivers really impressive airflow gains - as much as 9% higher at peak power than original intake system. Each filter is handmade in the UK. By reducing turbo spool by up to 500rpm in some cases through the enhanced efficiency of the system, lightning fast turbo response is guaranteed.