EVC THROTTLE CONTROLLER TO SUIT SUBARU EJ251 EJ252 EJ253 EJ254 EJ255 EJ257 EJ259 TURBO 2.0 2.5 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