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I didn't quite understand what you meant by including the pda into your harness. I know that on the rtek there is a seperate db9 cable that comes off the side of the ecu for a serial cable to a pda connects.
If your just wanting to clean up your harness i would strongly suggest just sticking with a oem mazda harness and ,maybe depinning the wires you don't need nor use, but as you said you are still running emissions. So pretty much there isn't going to be many unused wiring. As far as reducing resistance, as long as there is any ghetto hack job wiring done, you should be alright. Just be sure theres no crusty green or blue corroision on any of the wiring also.
Zack.
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