Indeed Maf, when I first had mine serviced by Mike Roberts, he fitted a modification plate to the ERG valve, I think it had holes drilled in it rather than an open inlet, or the other way round. Anyway, its been good so far, with the exception of having to replace all my wishbones and drop links at 30k miles.
I did the uppers and drop links last weekend, an hour and £50 a side. That cured the squeaking, now I have to do the lowers, 2hrs and £60 a side as one of the outer balljoints cracks now and again, plus when you go over rough ground, you can feel the inner bushes wobbling.
Matt - do you need to get the geometry checked/realigned after changing the wishbones? I had my car put on a Hunter machine when I had the tyres changed last year and it made such a huge difference to the handling of the car. It was much more balanced, stopped tramlining etc. Well worth the money. The guy told me that Alfas are well known for leaving the factory with geometry all over the place - he has never found one which was anywhere near tolerances.