Correct me if I am wrong but I beleive the Vortech outlet o.d. is 2.75". From there it goes to a 2.5" crossover tube (via a reducer elbow). At the M.A.F. it goes to 3" and stays 3" until the throttle body. Right?

Well, what if we could go straight to say 3" right out of the blower and stay 3" all the way to the TB? Is this good or bad?

Half of me says more volume = more air = more boost = more

The other half of me says Q=V*A, period. The Q from the blower isn't going to change (or is it?) so by increasing the Area, all you're doing is decreasing the Velocity (which I think is bad, right?).

Would a smaller or a bigger diameter pipe, if any, result in lower intake temps?

I'm getting a headache, could someone help me? Thanks guys.

(I am asking because I may be making a custom crossover tube to accommodate a water-air aftercooler so now is my chance to change the piping diameter. The diameter of the aftercooler is 3" if that changes anything.)

if you do it, make sure to get everything ceramic coated so it doesn't have heat transfer over the front exhaust bank.

i would do 3in for simplicity but really since your TB is only "about" 2.5 (assuming you have a stocker) 3in wont do you much good

I would def say 3 inch. If that is what the maf is then it would only make sense

I have constant 3" piping from blower to throttle body. I believe it helps because lower air velocity results in lower frictional losses and thus lower pressure drop through the piping.

Concerns about low flow velocity are more relevant to NA engines, which use the air inertia to achieve higher rates of cylinder filling, thus increasing volumetric efficiency. A supercharger, even at low rpm, produces enough boost pressure to completely overcome the effect of any loss of inertia.

no wonder why this guys a moderator

what diameter is your throttle body? I would guess on my stock tb it would be useless to run the 3in pipe

I think he is running the pathfinder TB, Chris.
But I would think the 3" would still benifit because the only loss you experience is at the TB instead of thru-out the whole pipe.