ok so look at this link explain this to me in lame terms im lost it also states (no obd 2)
Apexi-USA - Power FC "sitting down with a notebook and pencil"
Ok , in lay-mans terms the Apexi Power FC is a stand-alone engine management system meant to totaly replace the oem ecu . Very much like the Hydra Nemesis you lose all OBD2 (on board diagnostic , generation 2) function . They are meant for a pure racecar , with no need to worry about passing emissions inspections or voiding a warranty
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ttp://ngmhouseofpower.com/product_info.php?cPath=46&products_id=204
A piggyback tuner however only intercepts selected signals to override the oem ecu which otherwise remains in control , so you still have oem driveability and all obd2 functions . The Apexi Neo is a good example of a piggyback fuel tuner .
Apexi-USA - AFC-neo
My Mustang uses a Hypertech handheld programmer that reflashes the oem ecu via the obd2 port . This is the best option which is why i was hoping NGM would eventually go this route with the Forte . It changed the rev limit , top speed , fuel curve , timing curve , shift firmness , shift points etc.