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Hi, Ive got 2 intake manifolds here a regular one which came with a b18b1 out of a 96 integra rs. i also however have one from a 93gs which says PGM-FI accross the top. it appears a lot fancier and has capability for a lot more should i switch these manifolds, are there any benefits? also if i have a machine to bore cylinders can i bore out my throttle body and if so where would i finda larger throttle plate?
 

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Stick with what you have unless you have modifications to take advantage of anything.

Unless its an ITR IM, swapping stock ones is pretty much pointless.
 

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Yea,
THe PGM-FI (Programmed Fuel Injection) across the top is probably just Acura/Honda trying to show off their system and making it stand out in 1993 against the earlier cars in the late 80s that were still carburetted.
 
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