I am thinking of Purchasing another Spec V i am getting a good deal on the one i am looking at. but my concern is that the guy Put a 06 Spec v Ecu in The 04. His Reason for doing so is " That it allows for a Higher redline". The car seems to run Fine but obviously has a check engine light For the A/F Sensor. But What are the Pros and Cons to Swapping the ECU from an 06 on the 04?