why the 173 ecu?

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  • E30MACK
    Wrencher
    • Dec 2009
    • 230

    #1

    why the 173 ecu?

    why does everyone want the 173 ecu for the 325is motor?
  • Huff
    R3VLimited
    • May 2006
    • 2488

    #2
    Backwards compatibility with all I motors and all perfomance chips work with it. The older ECU's have to have chips made for them specifically (I believe; or at least back in the day they did).

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