Originally Posted by tedesco

from my experience I can only reccoment NOT to use such a manifould for all the vac lines. I would rather suggest the complete opposite. Reason for that is quite simple: There are a few "consumers" of vac and a few componets that only need the vac (or better mani pressure) as a signal. The biggest "consumer" is certainly the wastegate supply with its own line but also the recirculation valve needs vac flow due to its piston volume. Components like fuel pressure regulator, boost pressure sensor in the DMA/KLR... need only very little vac flow and use vac only as a signal. What happens when you connect all compnents that need vac to only one fitting is that locally, just in the fitting the vac pressure does not anymore corrospond to the mani pressure which it should do all the time. Reason for that is that due to the temporary high demand for vac flow during load changes the fitting is a restriction and as a result there is a difference in pressure in the signal lines compared to the manifould. DME/KLR receive wrong pressure data and fuel pressure is wrong as well. Certainly only for a small time under transient conditions but in my eyes a vac manifould sonds like a bad idea. This statement is a result of my own practial experience so far.