There's no effective way of using all the boost. Plus its a lot easier and more efficient to just put in a larger turbo. For the TDI that means a VNT-20 and thats just for starters; there are countless other upgrades you need to do in order to make the drive-train strong enough also so you don't blow up your engine.
There's actually a small handful of people doing it on TDIClub.com and its quite amazing how much power our little 1.9L engines can put out. I'm talking numbers like 275Hp and almost 400lbs of torque.
It all depends on how much money, time and knowledge you have
-Blake
BTW, you have the exact same car as me  (that is, of coarse, if you have an auto  )
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'02 Platinum Auto, R520 Nozzles, 1856 Turbo, Alligator Tune @25psi, IPT Valve Body, Koni Yellows, Eibach Springs, 3-Bar MAP, Straight-Through Exhaust, Dog Bone Mod, Bio-Diesel MMMmmm
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