This is a kit that TMC in Northern Ireland has out for the U.S. Abarth that is a little pricey but when you consider what you are getting its actually very cost effective for the return on investment. It takes the 160HP Abarth up to 210HP! Also adds Biltein shocks and a few other goodies. TMC didn't wait long to jump into the mix. They also have a tuning box that can be purchased and installed in about 10 mins that boosts the U.S. Abarth to I believe 189HP.
Scroll to the very bottom on the right for the info:
Abarth Engine | TMC Motorsport | Abarth Styling
They also make tuning boxes that are pretty much plug and play for a variety of cars including the Abarth in Europe.