you can get tuning boxes off ebay for them, my bro got one for his 1.9 tdi polo (90 bhp version) for £70 and it made a huge difference too power, mpg hasnt really changed either.
Does it pull upto near the redline? I had a 1999 90bhp A4 tdi and when I test drove it it was dire - it felt really flat I told them to change the MAF and WGFV before I even considered it. it made a big differnece - it was probably just the MAF that was knackered.
VAG never followed the Bosch requirement specs for fitting of their MAFs - They are mounted too rigid so the vibrations kill the MAF over time - it will happen again and again - so it is worth knowing how to test them.
If you have Vag-com measure block 3 for the MAF reading. Give it WOT from 2krpm. You should get at least 800mg/stroke air mass at 3k rpm.
I got mine remapped - made a big difference. I got around 125bhp out of it with a custom remap.
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