Lethal Performance 07-08 GT500 Pulley Pack with C&L Truflow Intake
The Lethal Pulley Pack is one of the easiest and most effective way to not only wake up your stock GT500 but add some Lethal power!

Typical Gains:
525-535 in the Summer months
550-560 in the Winter months

Included in the Kit:
(1) VMP Custom Tuned Xcal 2 or 3
(1) Metco 2.60" or 2.80" Supercharger Pulley Kit
(1) Metco Auxiliary Idler Kit
(1) C&L Truflow Intake System
(8) NGK TR6 Spark Plugs

Lethal Performance is proud to offer our own line of performance packs for the 07-08 Shelby GT500.. Custom tuning along with the industry's highest quality parts is what we've got for you. All of our custom tuned Xcal 2's, 3's and Livewires come with performance enhanced tune files from Justin Starkey at VMP Custom Tuning. Not only is Justin one of the most well known SCT tuners in the industry but also a GT500 owner himself. This has allowed him to do extensive dyno testing with many different combinations to come up with the special recipe for awesome power and excellent driveability.

C&L Truflow Intake System

C&L is proud to announce the release of the ULTIMATE air intake upgrade package for 2007 and newer Shelby GT500 Mustangs. Through extensive development and testing, we have been able to create a package that delivers more than 35% additional range and 36% more total airflow to the engine than the stock intake assembly can provide. This system has more range than any other aftermarket intake upgrade for these vehicles, which means that it will support a higher level of power than any other competing products. By using our proprietary flowstand to develop the mass airflow transfer function, we are able to program our tuning solution to the same standard that Ford coded into the processor from the factory. Instead of using "trial and error" or "guessing" to arrive at the proper MAF adjustments in the computer, we have programmed our tuning adjustments with the EXACT and proper values. This ensures that the computer has a more accurate control of the air/fuel ratio throughout all engine operating conditions.

The most notable effect of this is the fact that the "target" air/fuel ratio programmed into the computer is basically the same as what is actually realized in testing. Even though the Shelby computer is programmed to deliver a 12.0 to 1 air/fuel ratio from the factory, it ends up going into the 10:1 range at wide open throttle in "stock" configuration. If you look at the dyno charts provided on this page, you will notice that our air/fuel ratio graph is MUCH more consistent than the stock one, and it hovers just under the 12:1 point throughout the entire upper RPM range.

A look at the first dyno chart shows this comparison, and gives you a look at our "Best" stock baseline as compared to our "Best" run with the stage 1 package installed. Due to the fact that the temperature during testing was between 92-93 degrees, the numbers are a bit lower than what this same vehicle had generated in "more ideal" conditions earlier this year. All of these tests were performed at normal/full operational temperature, so you are guaranteed that these numbers are representative of "real world" driving conditions.

If you look at the second graph, you will see ALL of the "Back-to-Back" runs performed during this testing. Running these tests "over and over" ensures that you are getting a TRUE indication of what the performance improvements will be like "on the street". If we were to perform a complete cool down and put ice on the supercharger and intake assembly, we certainly WOULD have seen bigger numbers. It is our goal to provide customers with a realistic representation of what is typical for normal operating temperatures. As you can see, the gains were still impressive, and most people should expect to see anywhere from 60 to 70 more rear wheel horsepower from the "Stage 1" package, regardless of their baseline numbers .

Dyno testing for our upcoming "Stage 2" System, which utilizes a 2.60" diameter blower pulley showed a peak output of 520 HP at the rear wheels.

In "Back to Back" dyno tests at full normal operating temperature, we realized a solid 100 rear wheel horsepower gain over the stock configuration. Testing with the 2.80" diameter blower pulley showed little real improvement, making the 2.60" pulley the ideal choice for our "Stage 2" upgrade. This represents a 4 psi increase over the stock boost level, for a maximum of up to 13 psi. The attached dyno chart shows the effects of running different blower pullies on this engine.

We are still working on getting an aftermarket snout assembly for the supercharger for the "Stage 2" kits, but this has proven to be difficult. If we are unable to resolve this issue "immediately", we will begin selling pullies with tools in the "Stage 2" package to satisfy those who are unable to wait for the replacement snout assemblies. As always, we will post an update just as soon as these upgrades are available. This system has been in development for more than a year, and we are pleased to say that it was "worth the wait". We are confident that this upgrade is truly the best available for the new Shelby, and we are sure that our customers will agree.

Metco 2007+ Shelby GT500 Interchangeable Supercharger Pulley

Metco Motorsports Interchangeable Supercharger pulleys for your all new GT500..How it works is the smaller diameter of this pulley allows the supercharger's rpm's to increase. This in turn allows the supercharger to flow more air and create more boost pressure which makes power. The Metco pulley design uses a hub and ring style setup. This means you press the hub onto the superchargers shaft and then bolt the pulley ring to it with allen bolts. The hub and ring design allows for quicker pulley changes which can be done in less than 5 minutes.

The Metco GT500 Supercharger Pulleys are offered in a 2.60" and 2.80" size to add more boost and simply gain more HP and TQ across the board..

Typical Boost gains:
2.60" adds 4lbs of boost
2.80" adds 2lbs of boost

In stock and ready to ship.

NOTE: When using either the 2.60" or the 2.80" pulley you can use your stock belt by using the Metco Auxiliary Idler Kit

Metco Motorsports 07+ Shelby GT500 Auxiliary Idler Kit

Lethal Performance is proud to offer the Metco Auxiliary Idler Assembly. The Auxiliary Idler kit is designed to provide maximum belt contact of the supercharger pulley, thereby decreasing the amount of belt slippage in high boost situations.

FEATURES:

CNC machined from 6061 T-6 Aluminum for Accuracy and Detail

"Hard Coat" Anodized Idler Pulley for superior belt wear protection and bearing bore hardness

Top Notch OEM Quality Sealed for life bearing

A must when using a smaller supercharger pulley on your Shelby

Allows for use of the stock belt when upgrading to a Smaller Supercharger Pulley

Works with 2.8 and 2.6 Supercharger Pulleys

Comes complete with easy to follow instructions and hardware

Fits perfect with no modification necessary

NGK TR6 Spark Plugs- These are a must when upping the boost with a smaller supercharger pulley. The more boost you make the hotter the intake temperatures get. The TR6 spark plug is 1 heat range colder than the GT500 spark plug. This helps to cool the intake charge in the combustion chamber which helps to prevent detonation. The ideal spark plug gap for the GT500 running either the 2.60" or the 2.80" pulley is .035.