 The development team looked at the two principal competitors , the Ferrari F40 and the Porsche 959 . These were powered by compact , lightweight engines ; both the Ferrari and the Porsche used forced induction to obtain high power outputs from small @-@ displacement engines . Ferrari used a 2 @.@ 9 @-@ litre twin turbo V8 that produced 478 PS ( 352 kW ; 471 hp ) whilst Porsche used a 2 @.@ 9 @-@ litre twin @-@ turbo flat six producing 450 PS ( 330 kW ; 440 hp ) , resulting in cars that were significantly lighter and smaller than the XJ220 concept : the Ferrari was lighter by 600 kg and 710 mm shorter , whilst the Porsche was 250 kg lighter and 870 mm shorter . The Porsche 's specifications were closer to the Jaguar 's , with four @-@ wheel drive and a luxurious interior . By comparison the rear @-@ wheel driven Ferrari had a very basic interior , with no carpets , door handles or a stereo . 
