EVC THROTTLE CONTROLLER FOR SUBARU LEGACY BM BR BN BS EJ253 FB25A FB25B FA20F FA24F 2.0L 2.5L F4Modern vehicles rely on 'fly by wire' throttle technology to measure pedal pressure & position to send signals to the engine's computer and convert it to acceleration. Many of these systems have a noticeable delay. EVC throttle controllers by iDrive (rebranded as Ultimate9) reduce this lag and improve response to make the acceleration feel more responsive. Key Features: Eliminates throttle lag. Increases throttle response. Improves overall