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piggyback module

  mps aero
rite. . . . i was just wondering if these piggyback power modules that say they will give you "9bhp" on a 172 are actualy worth it or a load v sh*t?
anyone tried it? or is it a no go?
  e92 + E46 M3 + Cup
Only used when the standard ECU cannot be used, ie turbo, throttle bodies etc... normal Rstunner remap will work better on a mildly modified car, kit cost around £160-£180 delivered