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K20A2 type-r ecu and K20A3 ecu is different because in the information doug given the K20A2 it is the real VTEC it have vtec lifter but on K20A3 the vtec is activated by ecu or called VTEC-E i different story. The K20A2 i found on under the hood of RSX type-S model. So the ecu from K20A2 wont work on the K20A3
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