These pulley rings are designed for use with Metco Motorsports two-piece supercharger pulleys.  If you already have a Metco supercharger pulley on your GT500, one of these rings is all that is needed to change the boost level on your vehicle.  These pulley rings will bolt to your existing pulley hub using the same (5) fasteners, and no special tools are required for the change.

Our pulley rings are precision-machined from billet aluminum and then black anodized for long lasting surface protection. 

Listed below are approximate boost gains that can be expected when installing these pulleys on a Shelby GT500:

MSPR3.00: Stock diameter, no change  MSPR2.80:  +2-3 lbs  MSPR2.60:  +3-4.5 lbs

We recommend the use of our Auxiliary Idler Kit with the 2.60" supercharger pulley to maximize belt wrap and to minimize belt slippage.  Our idler kits are listed elsewhere in this section.  

Kit includes (1) pulley ring.  Please make your selection above.

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These spacers are those originally included with the Metco Motorsports Auxiliary Idler Kit for the 1999-2004 Lightning and supercharged Harley Davidson truck. These two spacers mount behind the billet bracket to provide secure mounting and perfect alignment for the idler pulley to the supercharger pulley.

These spacers are CNC-machined from high-grade steel and then zinc plated for corrosion protection. There are two spacers originally included in the MLI-90/MLI-100 idler kit, one long and one short. The M8 x 25mm hex bolt needed to mount the bracket is also included, but not shown.

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This exclusive kit is only available from Metco Motorsports!

This kit is based on our exclusive adapter fitting that is CNC-machined from stainless steel. The adapter attaches directly to the schrader valve outlet on the Ford factory fuel rail, and the opposite side of the fitting accepts the standard 1/8" NPT fitting for the included 1.5" fuel pressure gauge.

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This convenient billet adapter mounts directly to the factory (or aftermarket equivalent) fuel rail, sandwiched between the rail and the OEM fuel pressure sensor. The fuel block seals with OEM-style O-rings, so no gaskets or sealants are required. The installation is a quick and simple affair.

The block has one 1/8" NPT port on each side, providing a convenient tap for a fuel pressure gauge, a tap for a nitrous system, or both. A stainless steel pipe plug (not shown) is included to plug one port if the port is unused.

The kit includes the black-anodized (not shown) CNC-machined fuel block, O-rings, one stainless steel 1/8" pipe plug, and stainless steel mounting hardware (also not shown).

Note: The distance between the mounting holes on this adapter is 2.0". Please confirm the application before ordering. This fuel block is also available separately under Metco Motorsports PN MFF0003.

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Metco 03-04 Cobra Alternator Pulley for 2lb Lower Pulley (3.00")

Alternator pulley for use with oversize crankshaft pulleys to reduce alternator revolutions.

Fetures Include:

Pulley is CNC machined from 6061-T6 aluminum for light reciprocating weight, accuracy and minimum run out

Black anodized for appearance and superior surface protection


Most cases will require use of a slighlty longer belt

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Gen III Hemi with Twist-in Oil Cap, Including Hellcat

This breather installs as a direct replacement for the OEM oil fill cap, and absolutely no modifications are required. The precision-machined helix in the bottom of the billet stand fits tightly into the fill tube, and the seal is maintained by the included o-ring.

In supercharged applications, combustion pressures invariably find their way into the crank case, and this pressure contributes to pumping losses, elevated oil temps, and premature failure of engine seals. The breather serves as a high-flow vent to allow any pressure that builds to easily vent into the atmosphere.

This breather is fitted with our proprietary APV one-way check valve, so while internal pressures can pass through, outside air cannot be drawn through the breather and into the inlet tract of the engine. Your engine tune will not be affected by the installation of this breather.

Like all Metco breathers, this unit is CNC-machined from 6061 aluminum, and micro-finished on the exterior surface. The filter is a high-quality reusable unit manufactured in the USA by S & B filters.

Total installed height is less than 3". This breather may not be legal in all states.

For earlier Gen III Hemi applications using a screw-in style oil cap, please see the MBR0012 breather listed elsewhere in this section.

Note regarding the finish option: The breather base is CNC-machined from 6061-T6 aluminum, and then it is vibratory polished. At no extra cost, this breather stand can be ordered in a black-anodized finish. The breather element included with this kit is the same regardless of the breather base ordered: a high-performance gauze filter with a chrome steel top. Image 4 above shows this breather with the base anodized in black.

Installation Note: This breather is machined to specific dimensions to provide an air tight and leak free seal at the oil fill. We strongly suggest lubricating the O-ring on the breather base with WD-40 or a similar lubricant prior to installation. Learn More

Hex Insert For Use on 2015 & Newer Hellcat Challenger & Charger
This tool is designed to facilitate the removal of the original supercharger pulley on the Hellcat. Once the supercharger snout is off the car and on the bench, this tool slides into the hex opening at the front of the original supercharger pulley (behind the plastic cap). You may then use a 15/16" socket or breaker bar to unscrew the original pulley from the shaft.

This heavy-duty tool is CNC-machined from heavy-duty steel, and is sized precisely to fit tightly in the pulley.

This tool is usually used in conjunction with our HPT2000 Pin Holding Tool, listed elsewhere in this section.

*This listing is for the hex insert only.

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Pin Holding Tool For Use on 2015 & Newer Hellcat Challenger, Charger, and Trackhawk

Also Demon & Redeye, with Optional Adapter

This tool is designed to facilitate the removal of the original supercharger pulley on the Hellcat. Once the supercharger snout is off the car and on the bench, this tool slides over the pins at the rear of the snout to hold the supercharger shaft stationary while the pulley is unscrewed at the front. The benefit of this tool is that it spreads the load over all eight pins, which is far better than using a pry bar against two pins. This tool greatly reduces the possibility of any breakage during the pulley removal process.

This heavy-duty tool is laser cut from 1/4" steel, and precisely machined to match the pin pattern and pin diameter. The hole in the center of the pin holes is designed to allow a 15mm socket to pass through to hold the shaft bolt if needed, and the slot at the handle-end will allow you to thread a snout fastener to positively lock the tool in place while the original supercharger pulley is un-screwed.

This tool is usually used in conjunction with our HPT1000 Hex Insert, listed elsewhere in this section.

Important Note: This tool requires an adapter to work on the larger supercharger used in the Demon and Redeye Application. To add the adapter to your order, please select the appropriate option from the drop-down menu.

All Metco Motorsports products are designed, manufactured,and assembled in Anderson, SC.Learn More