Good news Mazda fam! I am finally going to be installing my CST4 here before long!! I also have been afforded the opportunity to see how much my ko4 setup will make and so here are the result.

For anyone new to mazdaspeeds and has questions concerning installing a bigger map sensor/ 3 port boost controller and what it intels here you go!
For the 3.5 bar map sensor it is easy to install imo. I have a fmic setup but could be a bit more to it with tmic guys im not for sure. Anyway, you will need an 8mm socket and ratchet for this bracket here next to the oil dipstick.

Unplug the big connector and tuck part of it under the power steering reservoir out of the way and the other wherever is best. Pull the bracket back and you will see the map sensor and 1 single bolt. My suggestion is to use the 7mm socket it takes and remove from manifold and then unplug as it is easier unbolted to get ahold of.

Reinstall with oil on the oring of the new map sensor and hook everything back up as before. Your tune will have to be adjusted for the new sensor to drive the car.
Now for the 3 port ebcs you will need to remove you air intake at the least depending on what you have done. I have deleted my egr so it was pretty spacious back there. Unhook the vacuum lines for the factory boost controller. Then, ubolt it using a 10mm socket and ratchet and unplug. Installing the new 3 port isn't too bad either and you will need a smaller size vacuum cap (I bought a set with multiple sizes.
Once you're to this point follow this diagram to know where each hose hooks to.

If this diagram doesn't help, seeing as some boost controllers don't have the numbering, I would recommend using CS install instructions.