The Rapid Flow Intake (RFI) was designed by Bully Dog Technologies with one goal in mind, to get the coolest air possible into your Duramax engine. To achieve this Bully Dog designed their cold air intake system to be fully enclosed, locking cool air in and keeping hot air out. Pulling cool air through your trucks factory air ports and utilizing a cone shaped oiled filter element these cold air intakes will improve airflow into the engine, decreasing exhaust gas temperatures, improving horsepower and fuel mileage in your Duramax 6.6L LML Diesel.
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