After 2 years of boosted fun I've finally gone to a Rev Built MS3. Up for sale is my FM Link Piggy Back ECU. It's run the car fantastically for the last 3 years, including passing OBDII emissions several times.
This will fit any NB2 car (2001 and up) and includes control for fuel and timing once in boost. I have everything you need including the extra fuel rail, lines (setup to plug right into stock locations with stock clips), injectors (Rx7 Red Top?), special intake manifold (to hold the extra 4 injectors), wiring harness, O2 clamp and ECU / keypad. (**This will also fit a 1999/2000 but you'll need a different intake manifold. Pretty sure FM still has the 1999 manifold I sent as an exchange for the 2002 one I needed)
I've run this setup for over 2 years and many track days with great success. I've run it with 6-14 PSI of boost (though 10 seems to be the real sweet spot). The timing and fuel are fully adjustable and includes a very conservative Flyin' Miata factory tune. There are not a whole lot of these NB piggy back setups around and it's the only fully integrated Fuel & Timing ECU that I'm aware of that is also OBDII emissions legal.
It's definitely not a MegaSquirt, but for no hassle, emissions friendly boost, it can't be beat.
I guess I'll start with an asking price of $450 (+ shipping from Atlanta) and see where things go. I paid more for the setup originally without the fuel rail or keypad.