The pipework from the turbo to intercooler (hotside) should be the same diamter as the turbo outlet and or bigger. If your turbo outlet is 2 and 3/8, get a IC with that size or 2.5 inches or 3 inches via a reducer hose.
For the intercooler outlet to throttlebody (cold side) its generally recommended that the diamter be the same size as the throttlebody.
My turbo outlet is 2 inches.
My intercooler outlet is 3 inches
My boost response is exceptionally quick, no abnormal lag at all. But just remmeber, i have a full house of mods, and no standard shit. Very different on a standard gt.
