The guys in germany at Dbilas http://dbilas-dynamic.de/dbilas_eng/Einzeldrosseleinspritzanlagen/Einzeldrosseleinspritzanlagen_Strasse/DKA_S.php?ID=7# have a product for your e30/e36/e46/e34 which will allow you to have individual throttle bodies  for each cylinder for your engine.  From what I can tell they include the chip and all you need is a filter to attach to the new intake manifold. They are TUV...
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Call me crazy but there is something about the mechanical-ism of carbs that is just better then the preciseness and  smoothness of fuel injection. Here you will see an m20b25 (bmw e30 325i(s) engine) normally fuel injection. However it has been converted to run 3 down draft weber carbs. With individual throttle bodies here is the spec list:...
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