NO NO NO NO! If the ic pipe was disconnected you would just get no boost, that has nothing to with it. You might have a blown head gasket, boost sensor, wires going to and from boost sensor should also be checked.

My brothers 3rd gen rx-7 had a diconnected ic pipe and didnt notice until boost was expected but it didnt prevent the car drove driving. plus we thought the boost sensor was out and it was just a bad wire.