The new XS-POWER Hybrid Valve gives your WRX or STi the subtlety of a recirculating Bypass Valve, combined with the power and sound of a Blowoff Valve. We recommend upgrading the factory valve when running boost above stock levels.
-Built to last from solid aluminium and brass
-Computer machined so there is no boost leak
-Out-flows factory valves for improved throttle response
-FITS 02-07 WRX & 04-09 STi factory bypass valve