 The cardboard model was taken into the Jaguar styling studio and two mock @-@ ups were produced . One was said to be reminiscent of the Porsche 956 , the other took elements of the then current Jaguar XJ41 project and Malcolm Sayer 's work on the stillborn Jaguar XJ13 racing car . The second design , by Keith Helfet , was chosen as it was " more obviously Jaguar in its look " . 
