There's someone on eBay.co.uk selling mod chips that claims to increase
power up to 20bhp.

But where are you supposed to stick these chips in an Alfetta, Alfasud,
1750, 2000, 2600, Sprint, Arna, 6, 90, Berlina, Duetto, Giulia, Giuletta or
Montreal?

And how come this guy has 100% postive rating?

ss.