Im in the garage right now using my cell, i will make it short.
I think understand what you just explained but I wouldnt put a bigger maf tube (2.75 OD) than what your intake is. It would just transfer the bottleneck somewhere elese and causing some intake resonance because of the relatively big gap of your last bottom picture.
IMO, your maf tube should be flowing slightly better than your TB. And from your maf to your intake manifold should either be the same or bigger than the flowing capability of your MAF tube. which help with throttle reponse if its a bit bigger
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