Bought the car with 116500 three months ago, put 2000 on it. The car is very peppy with plenty of power, even in 5th going 60 mph, its got pickup without downshifting. When buying a VW with this many miles on it, check the records. See if the timing belt was done, if the clutch was done, and any other major repair work. VW Timing belts should be done by 105, silly German engineering needs to use timing chains... more reliable. The car is rated at 7.5 s 0-60, mine is stock and its around 5.5-6 s. Stock turbo is good quality, but can easily be bigger. The back of the engine compartment(where turbo is) has plenty of room for upgrade.
power, handling, seats hold you in cornering,
Intercooler - Move from the passenger bumper area to front mount... that or give a bigger grille area so more air flows into it. Move the oil filter spot...