Hello. I have an Audi 100 Type44 Avant 2,3 5Zyl-10V quattro So Hab now before making a conversion. Would like to reach about 200 without turbocharging. I already have a free programmable control unit with broadband lambda probe for the injection to let the KE Jetronik III fall away. (->ca:150hp) Now there are still camshaft, valve springs and a fan curvature. So I made something smart that will cost the whole stuff. 00.- Valve springs 200.- Fan manifold 850.- So camshaft and valve springs I order now soon and build motor then. But 850.-€ for the fan manifold is already a whole batzen money. So I thought I just build myself the thing. (I know that I don’t have to enter any human but also don’t have to) Have spent some time calculating which pipe diameter I have to use at least and how I design the diffusor. My problem lies now, however, in that I know what length the pipes must have. I know that each tube must be the same length to each other but how long? Must be adapted to my knowledge from the engine. So now my actual questions. Can: -to me someone say what length I have to use or -to me someone send a dimensioned drawing by e-mail or – to me possibly even send a fan manifold that I can find the dimensions myself (Bin No thief!!! Send him back immediately afterwards ) I hope and wait for a couple of useful answers MfG Audi Mechanic M.H.