These fuel injectors came with a drive-by-wire kit we got from GM Performance. We used them to break the LQ9 408 stroker in naturally aspirated and had to replace them when we put a F1a Procharger on, just not enough fuel for 1000HP. I am throwing in the connectors we removed when we upgraded the injectors. MSRP is $88.84/EA injector not including the connectors. $350 + S&H