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  1. O

    Best new speakers to use with stock head unit.

    I'm keeping the stock head unit for the time being but I want to upgrade the speakers to get the best possible SQ. Polk db651s or JL Audio TR600-CXi or something else any suggestions?
  2. O

    mazda5 catalytic converter

    Anyone know how many catalytic converters and a o2 sensors the 5 has?
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