Made from billet aluminium, this recirculating diverter valve dumps the charge-air back into the air intake system keeping external noise to a minimum. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably. This valve decreases pressure between shifts to help prevent discharge tube blowoffs. This valve is a direct replacement for the plastic Bosch valve included in many aftermarket supercharger and turbo kits. - Polished Billet Aluminum - Heavy Duty - Compact Size - High Flow - Rebuildable Valve inlet/outlet dimensions: 25mm (1")