Cast aluminium plenum cover suitable for 4 cylinder engines. Cover is approx 4mm thick and 390mm x 105mm and tapers from 120mm at air entry to 80mm at opposite end. This gives a volume of approx 3.5 litres.Air entry is approx 75mm so suitable for throttle bodies up to 80mm diameter.Comes polished with 4 vac port take offs. Suitable for turbo supercharger conversions up to 3bar