Ian Royle test drives and reviews Porsche's 911, 944, and 968, looking closely at performance, practicality, and design. The 911 has several model variants, this one in particular boasts a 3.6 litre 6v box engine. The more modern 944 boasts a 3 litre 16v engine, produces over 200BHP, does 0-60 7 secs, and has a top speed of 145 MPH. The 968 has 4 different models, this one in particular sports a 3litre 4v engine, produces 231BHP, does 0-60 in 6 seconds, and has a top speed of 155 MPH.