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I would definitely use a trusted known Porsche 944 knowledged shop as any increase or modification in volume to the intake runners of a head will warrant velocity changes. Speed of air coming into engine is key and you want to keep that up. So remember flow rate doesn't tell the whole story and it's never about just 1 thing it's about the whole package, so attitude of (air pump) engine can change not necessarily for the good unless you design the entire air path to work together from entry to exit.
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'83 944 ROW zermatt silver/black, sunroof & A/C factory deleted, houndstooth sport seats, 7Q - 220 LSD short fifth, F & R 23.3 MM 951 M030 suspension, 16" fuch's, manual windows, club sport mirrors, Blk/Wht gauges, rear seats & all sound deadening removed, 968 rear wing, fiberglass hood & 937 F bumper
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