I would never ever run a factory ecu with big mods. They are limited to maps etc. Yes they can be made to work but you are just tricking it into thinking that it's got less airflow etc. There is no cold limits, hot limits, oil pressure limits etc. Why anyone would want to run factory ecu is beyond me. I have tuned heaps of both factory and links. Factory is great for sub 300kw.but as soon as motorsport or big power is concerned link all the way. Also links make the car drive far more aggressively so much better