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Yes, on a direct port system, it would require drilling the intake manifold.
Being that this is a 40-70 hp kit, it only requires the single nozzle in the
intake tract. A direct port system would be capable of delivering much
higher hp gains, but requires many more modifications to the engine, such as
forged pistons, performance ignition and adjustable ignition timing, a
dedicated fuel pump and additional fuel lines, and of course modifying the
intake manifold.
As someone else mentioned, fairly straight forward.