2L Vauxhall/Opel XE Large (51mm) Taper Throttle Body Kit2. 0L Vauxhall & Opel XE Large (51 mm) Taper Throttle Body Kit by Jenvey Dynamics. A kit for the Opel Vauxhall XE engine which contains Inlet Manifold, four 51 mm Taper SF Throttle Bodies (48 mm at the butterfly), Fuel Rail with Mounts and 90 mm long Airhorns. The best setup for a track or race car. This engine was from the original 16v Astra and GSI Cavalier and is used widely in Kit and racing cars. You may also need (sold separately): Double