Throttle body upgrade options

hooey_b

Just a question(s) for y'all:

I've been doing research on throttle body options for the vq37vhr, and the only solid thing i could find was an option to have the stock 58's bored out to a nice 63mm on the stock tb's.

I've heard since that the tb's for the Maxima (03-08 i think?) have the same connections, but just need a custom bracket to make fit. I was thinking about just going ahead and doing it myself, but i wanted to make sure there's wasn't anything out there that i've overlooked.

next slew of questions:

-for that much of an increase in flow, how risky would it be to run (assuming i get the maxima tb's to fit) them on without a tune?
i'm super cheap (aka broke) and don't have the tune on the schedule until about mid-end of next year.

-would it create a significant of a choke point if i don't up the diameter of my intake tubes?

-can anyone speak to this as far as experience or what you've seen? it doesn't have to be on the vq37vhr, just some details on what to expect from that much of an increase of air flow.