It's pretty easy for most applications, but NOT so much for 16V cause of the 'fingers' that have to go down to the injectors (which don't protrude past the intake manifold runners). Basically you would have to weld or thread extension fingers to connect between the rail and the injectors, which SORT OF makes having the fuel rail stock not as important (the stock is thick on one side to make o-ring seats for the injectors themselves... but the 16V would not use them, like I said. It's maybe NOT thick enough to thread in the fingers). Take a look at the Ross Machine 16V fuel rail to see what I mean. It's more of a fuel "rake."
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