The upgraded fuel system consists of a GSS 342 high pressure fuel pump and RC-440 injectors. The fuel pump is very noisy even though it has been wrapped in a special "sock" to muffle the sound. Here you can see the GSS 342 next to a stock fuel pump:
And here you see the difference between the high flow fuel injectors and the stock injectors (click enlarge to see the size of the ports):
To evenly distribute the fuel to each injector I use a custom dual feed fuel rail. It was made by tapping the far end of a stock rail with a 1/8" NPT tap and screwing a 5/16 hose barb in. If the fuel is not distributed evenly you may end up leaning out your #4 cylinder and you end up with a blown engine (look at page 2 for an example of that).
The Flyin' Miata Link ECU controls the timing and fuel system. It looks at a knock sensor and air temperature sensor to see if it needs to retard the timing.
I mounted the air temperature sensor after the A/W Intercooler so the Link would know what the temperature was before it entered the intake manifold. Here's the temp sensor and a shot of what it looks like inside the intake (you have to look close):
