focus 1.8 2001

Any suggestions?? the missis has a focus 2001 1.8 cl.. Yes, crap i know.but she intends to spend a few bucks on it. has only a kn filter now, fuk all really.but she wants to go an exhaust and any other cheapish engine mods..as well as suspension and all the usual looks crap.Wheels have been hard to sorce but can get them if really want to look myself.. i have checked things out but this sort of car is hard to tune even the lightest amount without being redulous.. what do ya reckon to start at... this car has the take off off a 180 datto at the moment.....