2000 si ecu questions

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i have a 2000 honda civic si. for electronics all i have is the apexi vtec controller. i was wondering if anyone made a chip or can reprogram my stock computor. i really dont want to go with an abd1 swap. im new to this honda stuff and was wondering what the aftermarket offered
if i switch to the obd1 what would be the best computor to use. as in from what car. i dont know much yet on the ecu numbers but im learning thanks for ur help