You would need a seal, extra passenger valve cover, 2 check valves, a pressure relief valve, ICP sensor harness extension, fittings for the oil rails, & pressure equalization line, a couple other random fittings, a belt, and most of the dual alternator bracketry, as well as hoses to hook it all up. That might sound like a lot, but really it's not too bad. With all the different fuel systems, turbos, etc, it's hard to get all the lines pre-built to a customer's preference to fit all around whatever mods they might have at a level requiring dual pumps, so we very rarely ship out a complete kit. If you buy a DIY kit, we'll include a list of stuff you need when you get it.