How do you nearly double the output of your brand-new GT500? Well, adding a 4.0-liter Whipple and a Boss 330 custom engine was obviously a good plan. Lethal Performance took its '10 Shelby from 421 hp and 440 lb-ft at the wheels to an incredible 805 rwhp and 673 rwtq on UPR Products' Mustang Dyno thanks to the gear you saw in this story. Moreover, with UPR's Jeremy Martorella in the driver seat, the Lethal machine started out at 12.74 at 112.29; at press time he had run a best of 9.66 at 146.19 mph. They are still upgrading and tweaking with an 8-second goal in mind, so this project is far from over. Stay tuned for more impressive numbers from Team Lethal.