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custom tune

  1. 262ci Forum (4.3)
    I've got a 91 4.3 z I've been curious about a "custom tune". At what point is a "tune" required or at least beneficial in some way I've got headers, edelbrock tbi int, adj f/ p regulator,underdrive pulleys, e fan, tbi spacer, injector pod spacer, hogged out the tbi. Msd ignition, etc. Any...
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