the price all depends if you manage to source used parts etc
New prices examples
-Intake 300
-milltek non res exhaust 1000
-autotech hpfp 300
-s3 turbo 1600
-s3 injectors 500
-Forge IC 400
You're looking at ca 4k give or take but you can source the parts used much cheaper
However with this kind of power you're also looking at supporting mods to give you most of the power like big brake kit, suspension, ARBs, WALK. Also very likely is you're clutch will be slipping shortly so you need to factor in clutch etc