Originally Posted by meangene924
the cali spec header is different from the fed spec one and isn't there more o2 sensors?
Yes the cali spec exhaust manifold is cast and stronger but your still not getting my point. If the car was a fed spec to begin with putting in a motor from a cali spec does not change the peramiters of the ecu. The ecu is what determines if the car is a cali or fedspec.