Not that much really, not if you include things like brembos,
coilovers etc.
S3 injectors 90quid
3' MAF for 15quid,
high flow manifold form INA 190(group buy)
Turbo from CR 600quid
Mapping 600quid
New jetex air filter 46ish
LCR fuel pump 120quid
im guessing around 2k+
Then there is little extras i need to do like, engine mounts, about 260quid and a forge replacement silicon hose kit for 155delivered.
I had most of the mods in place already(FMIS, tirbo back exhaust etc) so its not as expensive as you may think. Main costs really are turbo and mapping