Megasquirt is cheaper but you have to learn a lot as the trade off. Expect hours of studying and soldering and wiring. But it has unlimited options for whatever system you throw at it. Want over boost protection? How about fuel cut when the intake temp exceeds a certain temp? Or boost control, unlimited ignition and fuel parameter tables, run fans and meth pumps.
I'm doing it on my turbo 318. Haven't fully built the engine yet but I am very close to wiring it all up.
