Originally Posted by
foreigneRS
and keeping the standard ecu keeps oem quality components and strategies for cold start etc. an aftermarket ecu is a backward step imo unless converting from carbs or a really old efi system
I'd agree for the most part. However Ive seen reprogrammed OEM ecu's that have run horrifically both cold and hot afterwards. So a bad tuner can just as easily make a mess of the factory ecu as they can a standalone.
A well setup standalone should run almost as good or as good during cold start etc. It mostly boils down to whoever is tuning it.