I'm just about to build an intake for my car and then I thought that the ideal intakes are probably different from n/a to boosted, and since I will be adding boost in the near future.. I did a little reading, and found that the average tubing size for an aftermarket intake is approx 3". Also found that shorter tubing=more upper rpm ve, larger diameter same thing. No surprise there, directly analogous to a ported speaker box.
However, the connections to precision's 750 front mount are 2.75", so should I just build my intake 3" and then when I add the turbosystem, neck it down to 2.75" near the intercooler, or build a new intake, 2.75 tapering up to 3" to the last radius before the TB? The whole thing wouldn't even be an issue, it would all be 2.75, if I had an oem TB, but I have a 68mm unit. (3" connection.)
What outperforms what as far as this goes?
Anyone played around with different tubing diameters to the TB?
And while I'm on the subject, wtf is with hard intercooler piping on the evo making like 5-7whp more than the oem rubber ****? I assume it is a result of a dimensional difference?
Just curious, always trying to gain more knowledge..