there are two catagory : groep 1=standaard our almost so change shocks,better brake pads,transform exhaust line ,you can fit a biger carburator on the original intake manifold,iff you wish rally seats,sport steering wheel ,and our rollbare Not to forget a tripmaster some more light and you can start groep 2= shocks, exhaust with exhaust manifold,two double weber carburators 40 IDF, other camshafts, high comprestion pistons ,and all form gr 1.Shorter rear differenciel (but not need realy) now you have +- 140/150 hp and a real rallymachine that was one of the first realy works cars form fiat rally team .The where all over the world even two time Safarirally .I rebuild now one car in this specification and color green /white(roof for heath) and black bonnet front and rear