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Shelby GT500 Performance Pac - Packing Heat - Tech

Shelby Gt500 Performance Pac Front View
Shelby Gt500 Performance Pac Front View
To install the new headers,... 
   
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Shelby Gt500 Performance Pac Front View
To install the new headers, you will have to remove the steering column intermediate shaft and move it out of the way. This will allow you to sneak the headers in with a minimal amount of knuckle scraping, tool throwing, and cursing.
Shelby Gt500 Performance Pac Front View
The stock airbox and throttle... 
   
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Shelby Gt500 Performance Pac Front View
The stock airbox and throttle body is also taken out to aid in installation of the headers. While the airbox is out of the car, the stock air filter was replaced with the high-flow piece that comes with the Pac.
Shelby Gt500 Performance Pac Front View
The pulley swap is simple... 
   
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Shelby Gt500 Performance Pac Front View
The pulley swap is simple and easy with the proper tools. With the puller in place, we removed the stock 3.0-inch pulley, and replaced it with the new 2.70-inch pulley. The new pulley retains usage of the stock belt, so you don't have to worry about getting another rubberband for the engine.
Shelby Gt500 Performance Pac Front View
SLP is more than happy to... 
   
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Shelby Gt500 Performance Pac Front View
SLP is more than happy to perform the install for you in its shop, but for those do-it-yourselfers, an upper pulley installation kit will be needed to remove the press-on stock pulley. The new upper pulley measures out to 2.70 inches, and will kick the boost level up to around 12 psi.
Shelby Gt500 Performance Pac Front View
Shelby Gt500 Performance Pac Front View
With the Pac installed and... 
   
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Shelby Gt500 Performance Pac Front View
With the Pac installed and the car ready to go, Daniecki strapped the beast to the dyno, got the operating temperatures up to the proper level, and laid into the loud pedal. The blower whined, the engine sang, and the tires spun the dyno rollers to an SAE-corrected rear wheel horsepower number of 601.6 rwhp at 5,700 rpm, with torque checking in at 604.4 lb-ft at 4,100 rpm. Better take out stock in your favorite tire company.
Shelby Gt500 Performance Pac Front View
The Pac also comes with SLP's... 
   
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Shelby Gt500 Performance Pac Front View
The Pac also comes with SLP's Powerflow-X x-pipe assembly. The new x-pipe system and high-flow catalytic converters replace the stock H-pipe and cats, reducing exhaust restriction while changing the tone to the car.
Shelby Gt500 Performance Pac Front View
With the Pac, you have three... 
   
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Shelby Gt500 Performance Pac Front View
With the Pac, you have three different options from which to choose when it comes to the exhaust system. SLP offers the Pac with the Loud Mouth exhaust, as well as with the PowerFlow exhaust with 3- and 4-inch tips. The Shelby GT500 we tested was equipped with the 4-inch version of the PowerFlow system.
Shelby Gt500 Performance Pac Front View
The last piece of the 600HP... 
   
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Shelby Gt500 Performance Pac Front View
The last piece of the 600HP Pac puzzle is the Diablo Predator programmer that is stocked with an SLP custom tune. According to SLP's Hank Daniecki, the tune takes advantage of the added boost from the smaller blower pulley with revised ignition and fuel tables. The programmer plugs into the diagnostic port, and when combined with the rest of the parts included with the Pac, makes for a simple slap it on and go kit.
Shelby Gt500 Performance Pac Front View
To help us in getting the... 
   
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Shelby Gt500 Performance Pac Front View
To help us in getting the Shelby to hook, we swapped the factory rolling stock for a set of 26x11.5 Mickey Thompson tires on a set of 17-inch Mustang GT rims.
Shelby Gt500 Performance Pac Front View
With Editor Smith behind the... 
   
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Shelby Gt500 Performance Pac Front View
With Editor Smith behind the wheel, the Shelby was hustled to an 11.43 at 122 mph. Having gotten a stock GT500 to go a 12.38 at 115, that's a 0.95-second improvement in elapsed time, while picking up 7 mph on the speed chart.
Shelby Gt500 Performance Pac Front View
Here you can see how the SLP... 
   
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Shelby Gt500 Performance Pac Front View
Here you can see how the SLP GT500's dyno numbers (green) compare to the stock numbers (black) the Shelby laid down before the Pac was installed. All told, the Pac is good for a solid 84 hp and 94 lb-ft of torque increase over stock.
Shelby Gt500 Performance Pac Front View
This wouldn't be a proper... 
   
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Shelby Gt500 Performance Pac Front View
This wouldn't be a proper evaluation if we didn't put the whip to this Pony at the track. After driving the car to Old Bridge Township Raceway Park in Englishtown, New Jersey, we cooled the blower down, swapped the rear tires, and boiled the hides in preparation for our dragstrip assault.
SLP Performance Parts

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Shelby Gt500 Performance Pac Front View Shelby Gt500 Performance Pac Front View
Shelby Gt500 Performance Pac Front View
 
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