I'm sorry, how am I wrong about the END EFFECTIVE COMPRESSION RATIO. That would be your engine's normal ratio, plus whatever it is after you boost it. IE 8.5:1 normal compression + 7-8 pounds of boost, end effective ratio of around 12:1, that determines what kind of octane fuel you need to run to avoid detonation. To much boost, to much end effective ratio, wrong or not enough octane BOOM, new engine time. Not enough fuel, mix gets to lean, BOOM new engine time. DO THE MATH to determine you injector size and required fuel pressure and the intercooler goes AFTER the charger BEFORE the intake, otherwise you're cooling air into the turbo where it gets really damm hot and then dumped into the intake, no point for the intercooler then. Air charge get HOT under compression and picks up huge heat from the turbo itself, THEN it needs to be cooled to regain density for use by the induction system. Go to the garrett page read and learn. Or better yet go enroll in a tech school that actually teaches this stuff.