1999 AUDI A4 1.8T

for $1300 that car is a sweet pickup.

OP my suggestions are:

Je pistons: $500
IE rods: $350
Bearings, main studs, head bolts, gaskets, cranks seals: $500
turbo manifold. $700
Gt35R: $1300
exhaust: $800
injectors: $300
intercooler: $800
Tuning: $900

400 AWP

since we dont know if its an autofailic cant help you much on drive train.

coilovers and sway bars: $1200
wheels/tires: $1600

body work and bring it back to minty fresh: $XXXX

call it a day.