Below a few pics of a set of manifolds used to install the Bosch L-Jetronic (also known as Digijet) fuel injection system on a Type 1 (Beetle) engine.
The system is found on the 2.1 Microbus 'wasserboxer' engine. The manifolds were custom made by a guy I bought a complete fuel injection system for my Type 4 from. Although they were never on a car, I personally saw the Type 1 engine running with it on a bench and it sounded wicked!
As I said they are a custom once-off set, I haven't seen something simillar before, but I am sure they can be duplicated relatively easy. Normal twinport Type 1 manifolds are used, and the injector casings are merged (right word?) into them by means of aluminium surgery. The standard 2.1. air box is then also modified like in the pics, in order to be fitted between the heads, below the altenator, on the carb manifold's usual location. The throttle body/butterfly assembly of the air flow meter then bolts vertically on it, with a pipe connecting the air flow meter and air filter.
The manifolds are not 100% completed, as they still need some kind of bracket to hold the injectors. The engine actually ran quite well with the injectors only temporarily placed in the hole, with a little help of the vacuum created by combustion inside the manifold, of course
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This (previously unanswered) one is going on two years, and can almost qualify as a 'barn find' in Forum terms! 
