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The Powerjection I was previously known as the RetroTek BossEFI. Professional Products knows a good thing when they see it, and acquired RetroTek last year. The unit we opted to install on our Vortec 350 small-block was the die-cast, satin-finish 750-cfm model (PN 70000). We were easily able to find this model for sale online for under $2,000.