Can the MPI rail be removed and the drilled injector holes be blocked off to pass smog as well?
Why would you need to?
this is the thought process, if the system can be installed and not used through an OTS tune there is no issue, in my understanding it can be installed and turned on through the tune when it is time. the car doesnt know there is an additional rail or 4 other injectors unless told so. so an OTS smog legal tune wouldnt know to look nor throw any codes