Well yours not going to be able to mod anything in there that is going to beat a 1.4 and cheaply. if your realtl serious, consider putting a different lump in there, maybe a gt engine, but thats loads of work and you will have to change the whole thing round....
If you are thinking of looks, get a set of colourd pipes and leads, from ebay or halfrauds. maybe get a battery cover in chrome or colour coded, and ive got a number of a professional engine cleaning company if you want, clean your engine bay to a shine WITH option of chroming parts.
PM me if you want further details