What i did was firstly calculate the power to weight ratios of all three cars. Then i reduced the weight of my car until its power to weight ratio was the same as the 2.2 or 3.2, theoretically would the cars have similar urge i.e. if you put up a 159 1.8 that weighed 520kilos less than a 3.2 standard 159?
Im thinking as starting point for weight reductions:
plastic (& tinted!) side and rear windows (there is a set for the 159 on the market)
carbon fibre bonnet (cant find any trace of an existing product, maybe in Italy?)
remove air con
remove cd/radio player (replace with blue & me)
Install light weight battery
carbon fibre front seats
Remove spare tyre/jack
Smaller/More efficient lighter weight radiator
Getting more drastic:
remove window motors
remove speakers (& cancel blue & me!)
remove noise cladding in engine bay
ceramic break discs (if only cost a fortune £4k all in, but you can buy them for the 159)
How much you think that lot will add up to in Kilos?