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Yes I know about increased throttle body size on the 3.4 BUT both the throttle body and the Maf housing on the 986 are smaller. I expect you are using the original ecu which was in the body before you swapped engines so it expects to see the smaller maf. You can still benefit from the bigger throttle body and better 987 air filter without a bigger maf and the engine will run better without special tuning.
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