Originally Posted by spdu4ea
He's right assuming he's talking about 5.5psi "absolute" pressure (technically 20.2psi absolute pressure). You're right assuming you're talking about 5.5psi "relative" pressure (20.2psi absolute at sea level or 17.7psi absolute at 5000').
I though SC and altitude would want to know more about relative pressure since that's what influences the power gain? Hopefully my balloons and butt lube example illustrates it in laymen terms