Fitment Guide All VAG 1.8T engines All VAG 2.7 Bi-Turbo engines Porsche 911/996 turbo Ford Focus RS Renault Clio 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.