Welcome Adrian.
All, there's got to be a sticky thread for this too. We get lots of folks saying they're buying, thinking of buying or have just bought an MPS6 and wanting to know about weaknesses or future mods to do. When I first joined on the other MazdaClub forum I admit I posed a posed a similar question, but I had extensively browsed all the threads beforehand and found a lot of stuff but it was fragmented. The same questions have been answered here many times now, and a single forum would make a decent reference and save lots of repeat writing on DP's, catbacks, BOVs, ECU piggybacks, coilovers, boost guage mounts, rims, tyres, etc. Maybe too much to handle under one thread but maybe separate threads under those headings might work. Any thoughts??
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