piggy

  1. M

    piggy back ecu harm for egine?

    at a local shop near me there was a m3 that had a piggybacked Aem infinity that activated after a certain mph would this harm the 5.0 r spec engine?
  2. T

    Piggy Back Tuning

    Hey everyone, i reached out to a buddy working at a local performance shop and told me thye could possibly do a "piggy back tune" to my 4.6 Does anyone have experience with this type of tuning? High probaility of doing more bad to the ecu/engine than good?
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