well here is a picture of a Greedy intake I got with the 90mm throttlebody I think doing this is going in the right direction though if ya want to open it up there I would think open the entire intake from the turbo to the manifold >like 3" piping to 3"inlets and outlets on the intercooler .as far as the 300zx MAF being bigger ? as for me I got rid of all of that (using AEM management) I did this so the all around running and performance characteristics can be dield in perfectly IE > AF maps ,Idle, injector adjustment, spark dwell and timing, not to mention getting rid of the restrictive MAF sensorand a lot of cleaning of the engine bay (coolant hoses and wires to emission crap ) and using a programmable computer will let you get a lot more HP from your engine with reliability and peace of mind and if you want to up the boost, no problem or worrying about braking something ( dield in) the #1 in the picture will need to be swapped over to the greedy intake (cooling the head) and the #2 is something to do with EGR , I will plug this with a plate and run the Engine gas Return out side , I am not worried about loosing oil because of the excellent oil baffling in the valve covers and venting out any crank case pressure will up the HP also also, don't believe every one thing ya reed , ask around and get other opinions , the most repeeted response or answer to your questions are most likely the right one.
http://i150.photobucket.com/albums/s86/ ... th90mm.jpg