who makes aditional injector controlers or kits?

Try RB Racing's additional injector controller (http://www.rbracing-rsr.com/rsraic400.htm). RB is where I send a lot of people for suping-up their Harleys. These guys are wizards with forced induction and fuel injection. They'll answer all your questions in their simple, no-B.S. way (which most people appreciate).

thanks man

Wow, if you want to spend that much....

I used a Cold start injector from a Junkyard Saab or old VW. $5 at the junkyard. Got a Hobbs adjustable pressure switch from Napa for $25. Mounted the injector in the pipe, tapped fuel line to injector, set the pressure switch to come on at whatever you need, run a vacuum line to it, and voila you can run about 2-4 PSI boost more for less than $40.

whoa, nice ghetto tech. But it makes sense to spend a little for the same result...

Worked for me. The stock fuel system is good for around 14 PSI on turbo dodge's, with the 5th injector from the junkyard Saab I was running 15 PSI. I could have run 16 or maybe even 17 but I wanted to stay a little rich because I'm running stock Cast pistons.

ATR makes one for several different turbo cars. I used one years ago on my Buick Turbo V6.
To be honest larger injectors, fuel pump, fuel regulator and cutom chip or ECU is a much better way to go.

The ATR unit is around $375 with contol unit, check out thier web site.