Fellas, I wasn't debating the semantics of using accurate vs precise.

My original

was directed that somehow inches are more "precise" than centimeters.

The guy was basically saying that because 2.54 centimeters is 1 inch, that the unit of centimeters is more precise when he said this:

that measurements expressed in cm tend to be more precise than measurements expressed in inches.

Well the opposite can be said for inches, because 1 "imprecise" centimeter = a more precise 0.393700787 inches. By his logic, now the inch unit is more precise.

I just found that funny, thats all.

Now back to the BAR vs PSI vs MPa argument. I'm sure that if all the Subaru, Cobb, UTEC, whatever documentation expressed everything in MPa, then we'd be loving our stock boost gauge (assuming it was ACCURATE). But because the unit of MPa is foreign to most of us, we don't like the gauge. Just like if our speedometers for some reason came in FT/SEC instead of MPH. We'd be pretty anxious to swap that thing out wouldn't we??