There are plenty of controllers around. I use the CP_e Standback which works fine and can be infinitely tuned and will also handle meth injection. It will enable adjustment to boost as well as timing and fuel flow.
Stock boost for the MPS6 is technically 13.6psi, but my "factory setting" as it comes from the Mazda workshop (with my Standback isolated from their computer) is 14.0psi. You would be mad to push boost on a stock turbo beyond 17.5 - 18psi, especially without induction cooling mods and opening up the exhaust too, not to mention looking at ignition timing and maybe even fuel conditioning. All you do is create more heat than useful power and threaten engine life by risking detonation.
Last edited by Doug_MPS6; 18-06-2013 at 01:29 PM.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18