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To be honest I would fit the 996 3.6 inlet tee rather than the IPD plenum to mount the 74mm throttle body and then fabricate my own hose to connect to the airbox via the MAF. The IPD plenum is an unearthly cost and gives very little benefit in its own right. Ideally i'd suggest the MAF should be the later type in the larger housing , but this requires reconfiguring in the DME I believe. With the original MAF and housing you risk the MAF becoming a restriction and ofsetting any gains from fitting the larger throttle body and plenum. The MAF will have a set range its allowed to accept in the DME, force too much air through it and the DME can throw a fault ,though i've only ever experienced it on a tubo car. good luck with hte mods , it would be interesting to see the result you come up with.
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