as been said already if your car is running approx 180bhp then its already been chipped.

very good advice above though make sure all the basics are spot on i did this with my 5gtt when i bought it a couple of years ago, then go from there id look at uprating your turbo and intercooler plus get a 285 cam then go for a live map, your best off with a ford specialist but i know of one place near to me who specialise in all fuel injection tuning