if you can use the exhaust then why arent more people taking the stock setup from a ms3 and putting a turbo on the focus??It is not a duratec, similar yes. The mazda 3 2.0L, 2.3L and Mazda 6 2.3L are duratecs. The mazda speed 3 is a direct port injection unlike the duratec. I do also believe the head is way different. You can bolt up the intake or exhaust from a ms3 to a normal mazda 3 or focus.