id say lowering kit (40mm eibach or something along those lines)

set of alloys from another ford (factory wheels go well on satndardish cars imo) i think some 18" mondeo 5 spoke ones, they have a polished outer bit on the spokes/outer rim and the dished inner of the spoke is just silver (think they are ghia ones

k&n panel filter

then an st/ghia etc interior to have some leather and luxeries (unless your car has these already)