Quote Originally Posted by northiam View Post
http://www.alivetuning.com/alive-bou...tion-Guide.pdf

alivetuning state only 2 psi pressure drop. If you have no inlet manifold test connection then pre i/c is all you can do!
Numerous factors that will vary the pressure drop.
Inlet piping size
Intercooler sizer
Intercooler condition - clogged with oil, bent fins, etc.
Turbo charger condition
Temperature of air going in

In saying that I would go with Alive Tunings 2psi recomendation as it is safer than assuming 3 - 4 psi. So 20psi to 23psi would be the limit to take it to pre intercooler.