Here's a detail specific to...
Here's a detail specific to the '10 Shelby. The large vacuum hose to the brake booster needs shortening by 3 inches. It's an easy cut-and-refit operation.
Snorkeling
Jim Bell never misses a chance to remind us how dyno testing with the hood open is the work of the devil. He's right, of course, because we don't drive with the hood open. We all have a tough time replicating the volume and velocity of air associated with a 112-mph quarter-mile pass when strapped to the chassis dyno, but testing with the hood closed has its issues as well.
 Just like the stocker, the...  Just like the stocker, the Kenne Bell supercharger can use all the air it can get, so the snorkel is reused. Here it's being slide into position; the large oval, light gray Kenne Bell mass air housing is visible in the background. |  Kenne Bell checked the clearance...  Kenne Bell checked the clearance on the new '10 hood using three lumps of clay on the forward edge of the blower. Just like earlier Shelbys, the '10 requires removing the hood insulation pad and cutting out a couple inches of steel reinforcement webbing for clearance. It's a great excuse to use your die grinder and whiz-wheel cutter. |  Kenne Bell uses the same 2.8H...  Kenne Bell uses the same 2.8H supercharger on the '10 Shelby as before. This blower is optimized for higher boost outputs (it shines above 15 pounds), and seems perfectly matched to the gotta-have-more Shelby owners. |
 Looking part OEM and part...  Looking part OEM and part aftermarket, the Kenne Bell installation is certain to catch a buddy's eye when the hood is up. The giant air inlet system-the huge air filter, oval mass-air housing, Ford GT intake bellows, 2x75mm billet throttle body, and Mammoth inlet casting-are a visual highlight and speak volumes about this system's appetite for air. |  This is not new to the '10...  This is not new to the '10 Shelby but is worth repeating. When fitting a torque-happy blower such as the Kenne Bell to the GT500, an upgraded driveshaft is a must. KB destroyed a stock driveshaft during its initial GT500 development-it simply delaminated itself under the load-and hasn't let another GT500 out the door without an upgraded shaft since. This one went on the '10 and is a custom unit from Inland Empire Driveshaft Services. |  |
But Jim's insistence on considering underhood air flow makes him the perfect fellow to chase down the effects of the '10 Shelby's secondary intake snorkel, which is what he did, alternately testing with the hood open and closed, and with the snorkel taped shut or left open. And yes, all the temperatures were stabilized so the only variable was the airflow.
We're going to spare you the columns of dyno numbers all this testing generated and summarize it in a chart.
| Hood | Snorkel | Power | Torque |
| Closed | Closed | 437 | 427 |
| Closed | Open | 450 | 436 |
| Open | Open | 471 | 452 |
The '10 Kenne Bell installation...
The '10 Kenne Bell installation uses a larger 90mm pulley on the belt tensioner, so that's another easy change. Clamping the tensioner in a vise makes this one-bolt job that much easier.
Clearly opening the hood greatly improves airflow (especially in the cramped GT500 engine compartment, which is 10 pounds in a 5-pound sack). But that little snorkel does seem to help-it scored 13 extra horses in this test, plus a slight torque gain all the way across the rpm range. The higher the rpm, the more the gain from the snorkel. We'd say this is notice to all hot rodders that there's a reward to the guy who can get real airflow to his air filter.