most of the answers are on their site, or a quick search on ours would result in the same, not being a dick but for future reference I have caught myself writing a post and its already been covered.
install should take about 30 min roughly with basic tools, ecu will be fine but to properly get power out of it you'll need a custom tuning map, from a workshop retune or a accessport or similar
there are heaps of other brands, troy spedding on facebook is in prototype phase of making his locally i believe, not sure for a 6 but it'll be in the works
theres also JBR, COBB, HKS if you want to spend ridiculous money, and there are heaps of different throttle inlet pipes (TIP) around too for if and when you want a bigger turbo etc
a quick google search will find you most of your results but otherwise people mostly use Mazdaspeed, Subaru, Mitsubishi, Honda, Nissan, VW, BMW, Hyundai, and more Performance and Aftermarket Parts | Sport Compact and Tuner Aftermarket Performance Car Parts
08 BK MPS3 Sports Pack
MCA Blue Series coilovers | Corksport 2.5' TIP | Corksport RMM | SuperPro RSB | Delica RSB endlinks | Muffler and Resonator delete