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also, as you note, the original maf holder and new tb will be same ID so good there; thing is that the tubing you are using to join the two units fits to the OD which is 1/4" or so larger (the thick lip on the tb is 1/8" or so) so that the air compresses from airbox to maf holder, then expands, then compresses at tb again - wasted work. also, a decreasing radius intake system (ie, airbox larger than maf holder larger than throttle body) will tend to accelerate the intake airflow and facilitate cylinder fill for low rpm torque. small gains overall, and not worth the work of modifying the programming on your car when you can just use the original maf housing. i did it for (a) oem look, and (b) i have a pst2 and wanted to run a 996 tune on my car.
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