It was sold as the top end sports Stilo as Fiat Stilo Abarth (not sure if it had any further add ons to the title) in the same way the Golf MKs 1,2,3 GTIs were (forget the oddity that happended with the MK4 and the fact there are now range toppers over the MK 5 & 6's).
As far as I remember it was the only Stilo with that engine so isn't just a body kit on a standard car job.
I think it was also sold with a take on the selespeed system.