good cars but they do suffer with problems, more so than any other focus so make sure you always have a bit tucked away for repairs. common problems are lambda sensors, heat shields, inlet manifold runner control unit and cracking fuel pump housings. these problems can on problem cars come back year on year but mainly one at a time. i know people who've had no problems at all for years and others who have problems all the time but they all say they're great handling cars.

power tuning wise decat, cat back system and throttle bodies will only see about 200bhp if your lucky so better off just supercharging.