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Tommo speak to API (David) my foz is there at the minute having a few subtle tweaks with the suspension at the minute. I am sure he will be able to help, i have new age sti suspension on mine already, and as far as I know the engine bits are the same as they are all off the ej20. I think the exhausts are different although you can tweak them to fit.
I may well be wrong though as I am new to the foz after 5 years of impreza ownership so i could be wrong
could not say for sure but i would hazard a large bet that 99% of impreza owners on 18 who went from the std 16 or 17 have not bothered so you should be fine.
Owned mine for 2 years now. Imported by Torque GT 4 years ago and almost standard when I got it. Absolutely love this car. It's my daily, gets used for everything from kids runs to nursery/school, dump runs, every day driving to work and it's just brilliant!