This is a Blitz Sub-Injector controller I bought on eBay awhile ago from a repuatable overseas guy. I had planned to use this on an NX1600 but I ended up getting an ECU with a daughterboard instead. I have not actually hooked up it, but I was told it was working. That being said, it is being sold as-is. I have no manual, either, but you can probably track one down online if you need one.

This is a great way to add some extra fuel for that turbo setup, especially if you have a car that is difficult to chip. There are connectors for two injectors to be added$.
Looking for in the neighborhood of $110 shipped.