MY FIRST GEN 12A TURBO SEEMS TO HAVE LOST POWER,LATELY.I USUALLY ONLY DO SHORT JOURNEYS-WOULD THIS CAUSE A DROP IN COMPRESSION?IT HAS ONLY COVERED1500 MILES SINCE AN ENGINE REBUILD,AND FITTING THE TURBO.IT FELT REALLY TORQUEY TO BEGIN WITH.I HAVE HEARD YOU CAN FIT A 13B TURBO,WITH A BIT OF MODIFICATION.I'M INTERESTED,FOR SURE...