Hondata isnt a piggy back system, its a chip replacement for OBD1 ECU, Hondata S100, S200 (discontinued) and S300 are all chips at the end of the day, same with neptune and chrome, were as Apex-i Power FC and as mentioned the more expensive stand alone AEM and Haltech, all are true stand alone
A greddy E-manage is a true piggy back as it intercepts the ecu signals going in and out of the ecu and changes the values allowing for tuning for boost, bigger injectors, timing etc etc, infact this applies for all piggy backs
Stick to what ever ur tuners most happy with and comfortable using, pointless us telling you OP that this an this is better without consulting the guys who will actually tune ur car




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