 Further complicating the sales situation was the announcement by JaguarSport of a road @-@ going version of the Jaguar XJR @-@ 9 , the last of the racing cars to feature the Jaguar V12 engine . The Jaguar XJR @-@ 15 was developed by TWR and styled by Peter Stevens whilst the XJ220 was being developed at Jaguar , and featured the V12 engine and a host of other technologies not adopted for the XJ220 , including carbon fibre construction and the option of a six @-@ speed racing gearbox . It was considerably rarer and more expensive than the XJ220 when it went on sale ; only 50 were built , each with a list price of £ 600 @,@ 000 ( $ 1 million ) in 1990 . It was designed primarily for racing but could be specified as a road @-@ legal vehicle . About half were built as road @-@ going variants , which added £ 55 @,@ 000 to the list price . 
