- 50-State Emissions legal. - System replaces the fresh air inlet duct, upper half of OE air box, air filter, and inlet hose assembly. - Unique Intake Flow Accelerator (IFA) smoothes and accelerates the air flow into the system. - Injection molded, larger volume upper air box houses a reusable TRD high flow conical air filter. - Custom calibrated filter service gauge provides visual indication of when to service the filter. - Fully warranted.