I have no idea posted by SactoTodd on November 18, 2006 at 11:58 AM
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It made a noticeable difference on my friend's 90 na at high rpms; it is also a good investment if you are doing a tt swap since you can get the eprom upgrade for pretty cheap. Ash Powers can do a one or two day turn around for your ecu upgrade if you send yours in. You could also ask to keep your factory eprom in case you ever sold the na; then you can swap that in to make it stock and keep the ash eprom for a tt. [ www.ashspecz.com ]