Quote Originally Posted by UselessPickles View Post
Density (Lbs/ft3) is directly proportional to pressure. All else equal (same engine, same rpm, same atmospheric conditions, same intake temp, etc). The only way one device could provide denser air is to provide air at a higher pressure. If both produce the same pressure, then they are both providing air with the same density and same flow rate.
Good explanation Pickles! I kept scratching my head with what was being written in the other posts regarding CFM... As an example... The idea that you could push 1000 CFM @ 1 PSI vs. 1500 CFM @ 1 PSI through the same pipe, what the!?! Did someone not play with a garden hose as a kid enough to know that to obtain an increase in CFM at the same pressure would require an increase in the diameter of the garden hose!!!

For those who didn't get to play with a garden hose as a kid, here's the real formula.

cfm = area of pipe * sqrt (2*Pressure/density)

The idea that one turbo could deliver higher CFM at the same pressure, on the same engine, at the same RPM versus another turbo is just silly. That goes against the laws of physics (as previously stated by said poster named Pickles.)