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When I purchased my NA (with oem 270 injectors) a few years ago it came with both an Ash and stock ECU. I always drive with the Ash and only swap in the oem when getting a smog test (I'm in california and don't want to take the risk of not passing due to a rich Ash ecu). I can definitely notice a difference between the 2, however I have not experienced other ecu's to compare to.I had a bunch of questions for Mr Ash abiut the ecu and he answered promptly via email and was very informative. I did not give him any $ or send any parts in to be modified. OP are you referring to an aftermarket ecu that has been modified, or a full-on tune able system such as a Haltech?
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