Ford GT-5.4
The key to the 5.4L GT engine's 500 hp and 500 lb-ft is the Eaton-built twin-screw supercharger displacing 2.3 liters. It produces 12 psi of boost compared to 10 psi for the Cobra and 8 psi for the Lightning truck.

Read more: http://www.hotrod.com/techarticles/engine/113_0311_ford_gt_supercharged_54l_v8/photo_18.html#ixzz1ObinRsFh