you can use an 88-91 civic si ecu.....which is a PM6 you can use an 88-89 Integra ecu or a ZC ecu.....but you MUST make sure that it's a 5 speed ecu or it won't work. I think that the Integra ecu is the best because the zc ecu has a 112mph limit on it, the integra ecu doesn't
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