The VAG Type 5 Smart Port Diverter Valve features innovative new drive-by-wire friendly staging technology. This eliminates compressor surge at both low throttle and high engine load while smoothly integrating with factory engine mapping. Plus a new hard-anodised, lightweight, aluminium piston provides better valve response and prolonged piston life. – See more at: http://www.turbosmartdirect.com/Product-Categories/Model-Specific/Smart-Port-2-0L-VAG-Golf-R-S3-BOV-Black.html#sthash.K76cYdgR.dpuf