the only problems i have really run into are the idle air control solenoid..my old sensor was a 3 wire sensor, the 2.5's is a 6 wire sensor..(none of those wires being ground!)
i might try to "fabricate" a custom mounting flange and custom tube-routing to get his to work. for now im going to set the car with a high idle(1K at first)
right now we are actually stuck trying to get the 2.2 headers off hte cat. converter, the exhaust is still hanging on the car, so i think im gonna remove it and try once its on the ground. i tried heating hte bolts, every type of penetrating oil, im about ready to grind the nuts off!
oh, i didnt do a full ECU swap, i am running this off the 2.2 ECU and wire harness, the only things i had to cut was just before the sensors(fuel injectors, C.T.S. etc...)