4" Intake Kit for T3/T4, T67, GT30/35 Turbo chargers. Includes 4" Polished Aluminum Intake Tube, Vacuum Port, Giant 9" Long K&N Filter, & Silicone Elbow. Large diameter tube lowers pressure differential at the compressor wheel increases spool. Aluminum tube will not heat soak like steel tubes. Will NOT work with stock turbo.