We've seen nearly every combination of power adders under the hood of '07-current GT500s.
And the wilder the combination is, typically, the wilder the appearance. And when they look stock on the outside, chances are that they are mostly stock under the hood as well. There's nothing wrong with a bone-stock Shelby; and on the other hand, we enjoy a Kenne Bell-blown showstopper just as much as everybody else. In other words, there's no such thing as a “sleeper” GT500.
Or is there? We think we've found one in Mike Bobo's '07 Snake. Mike isn't your average Mustang owner, and certainly not your average GT500 owner. Since he already had a Duttweiler Performance-built GNX, a Hennessey-built Viper, and a JMS Chip and Performance-built twin-turbo Ford GT supercar in his garage, Mike wanted something a little tamer for normal street duties—but it still had to be able to make quick work of pesky imports and Vettes.
Mike first spotted the white-with-blue-stripes Shelby in the shop at JMS (Lucedale, Mississippi) while he was there to check up on the work being done to his GT supercar. He wanted it, but it wasn't for sale. In fact, the owner had just dropped it off to have the JMS crew install a 2.9L Kenne Bell Twin-Screw supercharger. The owner didn't want to sell it, but Mike finally convinced him to let it go.
Mike drove the car with the Kenne Bell for a while. He enjoyed the 700 rwhp and cool whining noises, but he wanted to add his own touch. Wanting just the right amount of street manners mixed with all-out absurdity, he dropped the keys into the hand of Monty Johnson, owner of JMS. There, Johnson and the rest of the JMS team transformed Mike's ordinary GT500 into an all-out street screamer.
To satisfy Mike's taste for lots of power, he decided to go with a custom twin-turbo kit. But before it could be plumbed the way he wanted it, JMS had to do some rearranging in the engine bay. The ABS module, fusebox, battery, and all the associated wiring and lines had to be relocated. Then the team focused on the engine.
Though the stock GT500 engine was stout, it couldn't handle two 62mm Turbonetics turbochargers. Using the stock block, JMS built a bulletproof, boost-friendly short-block using the stock crankshaft, billet Manley rods, and 8.5:1 Manley pistons. It's topped off with worked-over stock heads, GT supercar cams, and a one-off custom sheetmetal intake.
Once installed, the plumbing began. After the turbos found their homes just behind the headlamps, the JMS team connected the dots with Jet-Hot coated hot-side tubing and polished aluminum cold-side tubing. It then fabricated the remainder of the exhaust system using Magnaflow mufflers.
Elsewhere, JMS added 80-lb/hr injectors, a JMS Powermax fuel pump voltage booster, an SCT BA5000 MAF, a few gauges, a Spec clutch, a Steeda shifter, and a few Steeda suspension parts. Everything else on this car is stock. Oh, Mike did have the LeMans stripes removed and he added some fancy wheels and tires.
So how much power does it make? With a JMS/SCT tune, it laid down 931 rwhp and 878 lb-ft of torque—on 91-octane pump gas, and at 18 pounds of boost. Granted, it's capable of much more than that, but this is a street car. And at over 900 horsepower to the ground, this thing is already a handful on the street. So if you're ever in southern Mississippi and run across a stripe-delete white GT500, don't underestimate it, because it could be Mike Bobo in his sleeper Shelby waiting for you to make the first move.