the kl36 ecu figuring you have the ze installed. you'll have to pick up a je50 vaf sensor if you do that... or there are those adaptor chips that turn the a-spec ecu into a j-spec ecu w/o the need of that je50 vaf.
here's someone that's selling it for $80. this will unleash the full poteniol of your ze, including new vris points, and a differn't fuel curve.
-Tom
EDIT: Woopsy, just noticed you had a 96, meaning you have obd2, the eprom won't work for you...
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lol