[robo]

Range rover had the exhaust type system in place for a number of years without emmision problems. They had a small filter on the back of the manifold to allow a small amount of clean air in as the engine was running,that might have been the way round the problem. The trouble with inlet type pcv is that at wot there is no vacuum and fit any type of race cam and you can forget it,. Honda reckon pcv is worth about 5% on the dyno, like you say not much but add in better oil control, less oil leaks to name a few I think I will have a play. Will let you know how I get on

Bob