The 13B NA Power Thread.

[Whizbang]

from efihardware:

Each throat flows 399.6 CFM @ 20.4 inches of Vacuum.
On the 55/53/50 tapered bore model with a 75mm long Pro-Series Ram tube fitted.

without running both setups on the same equipment with some standards enforced, it might be difficult to compare them.

im assuming the velocity stack going into the throttle body will be sufficient, but if the throat is 50mm (ill have to measure it one day soon) i would not want the runner to be a larger diameter than the throttle body for a variety of reasons as far as i can reason, plus its only going to flow as well as the smallest part of the track.

Then again i will be also limited by what is available for piping. For 50mm, a 2" od piping with a 1.902 ID would be the best to try and maintain consistency and easy to purchase from speedymetals.com. Ill just have to verify if its not too thinned wall for welding or bending. If that is the case, then ill step up the OD.