When you converted from sd to mass air, did you buy the wiring kit and use your existing sd harness or did you buy a complete harness from somewhere used....which is easier to do...I am a little hesitant about buying a complete used harness off somewhere like ebay for fear it may be defective...but since my engine and everything is out now I figured it would be easier to just get an entire harness and just make the swap...anything I should be wary of?