Hi there. I sold my mk3 diesel this year but had a long love affair with it. This is my build thread:
http://www.vwwatercooled.org.au/foru...est-12233.html
Everything i've done in there is applicable to your car, with the main difference being that your car has direct injection and an ECU controlled injector pump, so in order to make small tuning changes you will need to modify your ecu - but all of the mods I did for exhaust and intake apply. I used many different turbo's, had a couple of intercooler setups and I tell you this now - you can't do a proper FMIC setup with good benefits without cutting into the bumper support panel - but that doesnt mean you need to weaken it (theres a link in the build thread to another thread detailing the FMIC install).
In the end, I sold the car making 125whp and 300Nm. The standard engine puts out 74hp at the flywheel. Your TDI is more like 90hp at the fly (with everything working properly and when new) so you have quite a ways to go before you get to GT golf power - but its all fun.
Good luck.
'07 Touareg V6 TDI with air suspension
'98 Mk3 Cabriolet 2.0 8V
'99 A4 Quattro 1.8T
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