Thread: n55 hartge tune
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      07-02-2012, 03:19 PM   #11
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Quote:
Originally Posted by alexmtl_135i View Post
This is only a chip that you connect to your ECU and other sensors.
???

I believe the Hartge tune is a 'proper' bench flashed tune of the ECU.....it's not a 'piggyback' unit.
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