GruppeM Ram Air Intake System - Subaru - WRX S4 VBHSpecifications: Manufacturer: GruppeM Reference Number: FR 0420 Intake Type: Airbox The air guide panel, exclusive to the WRX and LEVORG , introduces the wind from the front directly into the filter, significantly reducing intake temperature. The original air filter and carbon case bulkhead with excellent heat insulation properties improve performance. You can enjoy sharp response, torque rise from low rpm, and increased power in the high rpm range,