Deceptor Pro II GFB-T957 WRX motorised Blow off valve or BOV with GFB TMS advantage. In cabin patented adjustable venting bias system diverter valve. Now you can control the sound of the BOV from inside the cabin! So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even further... Adjust your BOV venting bias electronically on-the-fly Revised porting to optimise flow and venting bias Compact design fits in most factory valve locations Direct bolt on for many vehicles New bore finishing process ensures a lifetime of reliable operation Deceptor Pro II features Direct bolt-on for most vehicles available: Remote proportional venting bias/volume control- from silent to loud or anywhere in between Sleek, compact in-car BOV volume controller with backlit dial End point adjustment to control maximum vent to atmosphere bias setting Volume adjustment mechanism driven by a high-torque geared electric motor Durable, low-friction ger train supported by precision sealed ball-bearing Supplied with all parts and wiring required to have it up and running quickly and easily