got a ko4 of a audi s3 its only done 40k the turbo has and iv paid £100 for turbo off father inlaw 
Nice one!
You will need bigger injectors (380 cc iirc)
Different/custom mannifold
New clutch
Re-map too
And a load of other little bits that will add up im sure (e.g. new oil lines, cooler)
Edit: Just found this from somone who has done it! I would Ignore the LSD though
i thought be cheap little upgrade as got KO4 turbo downpipe and cat for £100! but then one thing after the other all adds up! you need
turbo and all lines
turbo inlet pipe
exhaust manifold
downpipe
cat (decat, sport)
cat back exhaust system
injectors
4bar fuel pressure regulator
front mount intercooler
3" MAF and airbox or prefererably CAI
uprated clutch
bigger brakes
and best off gettin a limited slip diff to put down the extra power
and a custom remap
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