cast aluminium plenum cover suitable for 4 cylinder engines. Cover is approx 4mm thick and 380mm x 110mm and tapers from 130mm at air entry to 80mm at opposite end. This gives a volume of approx 4.2 litres. Air entry is approx 80mm so suitable for throttle bodies up to 90mm diameter. Comes polished with 4 vac port take offs and blank boss suitable for idle valve. Suitable for turbo supercharger conversions up to 3bar