OK.... Thinking of doing this as DV response not always fantastic. I am also having a few problems with car under boost (which I feel may be N75J related). Have been doing a bit of research into this and there appears to be about 65 million ways of doing it. I have found a lot of info on the VW forums about this - see links: http://uk-mkivs.net/forums/t/265883.aspx & http://uk-mkivs.net/forums/p/213950/1381524.aspx#1381524. Now these are two very different ways of doing this, and I notice that the N249 is actually on the metal plate that attaches to the manifold in these examples, where as mine is on the rocker cover with the vac chamber... Simply, I haven't got a definitive answer as to any benefit from this, aside from clearing up a sh*t load of pipework which I think looks awful. What are people's thoughts?