Type-V Econoseal harness for v3.x assembled controller, as described on wiki
No firewall connector, but the relay part is detachable, so it's easy to pull back through the firewall (if the engine is removed from the engine bay).
You can actually order without the (slightly overengineered) relay part: in that case, instead of the relay part you get a matching 10pin econoseal connector to mate the main-loom with your wires (the supply wires as bare minimum). This is useful if you already have fuel-pump relay, or you can buy it separately (and keep weight at minimum, by using 1 relay instead of 4).
In any case, the harness allows user customizations. Includes the detachable injector-part: I4,I6 and V8 version in stock. (use the 6cyl version for 5cyl installs: the 6th injector connector is useful for boostcontrol solenoid). Also available without injector-part : you can make your own, eg. for Japanese injector-connectors.