Well all the above ARE needed for Phase 2 but not Phase 1
Hence why going from phase 1 to phase 2 costs circa;-
Exhaust say £600
FMIC £700
FPR £dunno
Induction Kit £150
Phase 1 to Phase 2 software £50
Downpipe is preferable
Total Cost say £1,500 ish for 10bhp tops
TBH I'd rather spend £1,500 on
Phase 1 remap and suspension mods
or
Phase 1 remap an Quaife LSD (you may need to stretch a little to £1,800)