Well I spoke to the learned folk at the local dealership (like we have a big choice in Canberra) and with his official VW hat on he had to advise me that any changes to the stock configuration may void my warranty... 
But he was able to advise me *not* as a VW mechanic, that there should be no problem at all with swapping out the shocks/coils, provided that the mounts were the same. He also said the tow pack doesn't provide different springs, so all's good on that front.
He did warn against changing the calipers/rotors because the master cylinder on the TDI is not as big as the GTI's one he thinks, and could cause all sorts of nasty problems (can anyone confirm this?).
Interestingly, VW doesn't provide the information to decode the colour dots on the coils to find out the spring rating. The service department just matches the colours to what the VW manual says. 
I've gotta get a couple of small warranty issues attended to in the coming weeks, so there's no way I'm going to give them a reason to make excuses for not honoring it. But after that's all sorted out...
Last edited by mr_walker; 01-09-2008 at 03:11 PM.
MY08 Jetta TDI, DSG, Platinum Grey, Anthracite Leather, Foglights
MY07 Polo TDI, Reflex Silver, GTI Wheels, GTI Suspension
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