Hi and Welcome to the site. All types of car and car owners are welcome here. The arbarth is the sporty version - do you know what the base power level is? What engine size is it? I don't think there is much you can do but you might find that an engine swap will give a bit more power - there are quite a few fiat options but they are all relatively small engines though.
__________________
I got complimented on my driving today. There was a little note on the windscreen; it said 'Parking Fine.' | 
HI 
Linear Mode
