Has anyone had a look at this site in Italy? They claim a modest performance boost for €270.00.
http://www.ricambituning.it/en/product1.asp?id=211&cat=25&mn=FIAT&sr=Stilo&md=338
http://www.ricambituning.it/en/product1.asp?id=211&cat=25&mn=FIAT&sr=Stilo&md=338