Nothing.
The Porsche 968 Sport is a fantastic car. Bigger, better, faster and more rare then a Boxster.
With a large boot (Big enough to fit two racing bicycle's) and two rear seats for two small cats it's an ideal coupe for a couple, who have no need to cart people around...
The handling and performance is superb, but the running costs a little high.
Pop your bonnet and check your engine. if your cylinders go side to side then your engines broke. 944/968's cylinders go up and down ;)