I run an e303 cam. The wonderful part about using a megasquirt is I don't need a maf, and can do all my own tuning. The software is pretty easy to use once you figure it all out. The best part is I will never need to pay someone to tune the car, I plug in my laptop and go at it.
Oh and the MS I am running I built myself, it plugs into the factory harness. Or you can buy one already assembled for around 800$ No need to swap harnesses around just plug it in and go. If you are interested I can give you a video walk thru of the install and software.