help with my Focus st500

hi all

i want to put these upgrades on my focus ST500 but dont know if they will be ok ...any commenst or suggestions would be a great help

K&N Filter
de cat pipe
RS intercooler
RS downpipe

Thanks Rick
i already have a rs intercooler and down pipe and dont know weather to put them on some say theu will improve power some they they wont

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