Good question, I would think increasing the piping to much just in one spot will change the flow profile of the tubes. Not to mention you slow the velocity of the air down as it hits the larger boost tube only to ram it as fast as you can back down to 2.75" and through the TBs. If you could find a way to get bigger throttle bodies (maybe off a titan? have no idea if nissan has larger TBs) then you might be onto something. lol.
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