Below you will find intake manifolds for several different cars makes and models. We have for example for BMW M50 / M52 / M54 engine with very high flow. These manifolds are many times mounted with funnels inside. It gives the same high flow as if you had damper housings -
If not more. This is because the air does not have to pass a damper at each intake duct. Many of the manifolds we have are incl. manifold, nozzle bridge and throttle. In some cases, such as the RB25DET engine, there are also radiator hoses and fittings for mounting - Ie. that they are complete sets that are easy to assemble.