Originally Posted by
SPD_FRK
If you have the 99-00 ECU and harness then yea, no codes...all you are doing is ripping the old stuff out and putting in the 99-00...but why?
The problem with this though is you are basically taking "two steps back" in any build progress, or growth capabilities later. If you are a 99-00 Galant, you will not have any codes from doing the 5spd swap, great...but you have no EcuFlash option. If you are a 01-03 Galant 5spd swapped, there will be the 5 solenoid codes thrown, but you are able to flash and tune with EcuFlash.
The 99-00 ECUs are really just "limited" and they really aren't worth swapping over to if you are a 01+ Galant. If what I have found works to resolve the codes from being thrown then we eliminate a common issue for the 01+ ECU and 5spd swapped drivers.