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Metco Motorsports Auxiliary Idler Pulley Kit - Double Bearing (07-14 GT500)

Market Price $215.99 You Save 17% ($36.00)
Our Price

$179.99

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  • Item 49704
  • MPN# MSI-90D

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Features, Videos & Details

  • Eliminates Belt Slippage
  • 90mm Double Bearing Idler Pulley
  • CNC-Machined Aluminum
  • Allows Original Supercharger Belt to Be Reused
  • Fits 2007-2014 Shelby GT500 with Smaller Diameter Pulley

Review & Installation Video

Justin: Hey, I'm Justin with AmericanMuscle.com and this is the Stage 2 Power Pack Bolt-On Build-Up for all 2007-2009 GT500s. This Power Pack is for the GT500 owners who have already taken care of some of the basic bolt-ons; your cold air intakes, your tunes, and are looking for more power out of your supercharged 5.4 liter. Now if you guys are looking for more power out of your Mustang, whether it's a GT500, a GT, or a V6, be sure to check out some of our other Bolt-On Build-Ups by subscribing to our YouTube channel if you haven't done so already. This entire pack is centered around a very popular supercharger mod that's going to increase our boost and therefore increase the horsepower on our GT500. However, just like anything else in the forced induction world, you can't just add more boost without addressing other key areas of your ride to ensure you're getting the most out of each mod, but more importantly to ensure the safety of your motor. So first, let's get to everybody's favorite topic, more boost. The first mod in our Power Pack consists of the Metco Motorsports 2.6 Inch Upper Pulley. Now a smaller pulley like the Metco here is always a very popular choice with supercharged applications because what it's going to allow you to do is spin that stock blower much faster, resulting in more boost. In fact, we should be looking at three to four pounds of additional boost compared to the stock three inch pulley. The Metco itself is a very nice piece and is actually very popular with other GT500 owners here on the site. In fact, if you want, you can just click on the link below to read up on some of the reviews. Now the design is a two piece design, so you have a hub that presses onto the blower shaft first, and then the actual pulley bolts to the hub using the included hardware. This is just basically going to make any future pulley swaps a complete piece of cake. I really can't wait to see what a few extra pounds of boost are going to do to our power number, and best of all, that factory Eaton blower should really be screaming. With the pulley out of the way, let's talk about some of those other supplementary mods that I told you guys about at the beginning of the Pack. Now again, you can't just bolt up a pulley and go without addressing some other areas. Case in point, that smaller pulley has now created some excess slack in our belt which basically our factory idler will not be able to keep up with. What this is going to result in is dreaded boost and power robbing belt slippage. Enter the Metco Double-Bearing Auxiliary Idler Pulley Kit which we also installed on our '08 here. Now this is going to take up the extra slack created by the smaller 2.6 inch pulley and just create plenty of belt wrap to prevent any belt slippage, and more importantly it's going to ensure that those boost levels stay rock solid all the way through the upper RPM range. On top of that, the double bearing construction will ensure a little bit more durability over time, it might actually be a little quieter, and for a few bucks more it's really a no brainer. Finally there's one more part to go over before we bring in Mike J from Bama to tweak the tune a little bit for us, and of course turn the rollers one more time. With that pulley in place, we're really going to be spinning our blower a lot faster than we were before which of course will lead to more boost meaning we had to address our spark plugs. So we installed the NGK TR6 Plugs which really are the go-to spark plug for any Shelby owner who is upping their boost. They're a one heat range colder plug compared to our stock plugs which will help avoid any possible detonation. An important note, just make sure they're gapped correctly before install to avoid any spark blowout. Definitely recommend doing these plugs or something similar whenever you really start cranking up the boost like we are here with the '08. Alright, well with all the new parts in place, we have Mike J from the Bama Performance Team in here working on the new tune for us for all increased boost that we're going to be seeing thanks to that smaller pulley. Now Mike, obviously the car's going to be seeing a lot more boost than we were before. How does that affect things on your end? Mike J: Well basically with the higher boost levels, we're going to be seeing right around 12 to 13 pounds. I've already gone ahead and made adjustments to the ignition timing tables to make sure that we're not going to see any detonation at all. I'm then basically just looking at air-fuel ratio to make sure we're in that sweet spot. Justin: Awesome man, I know those colder plugs should definitely help with that detonation too. Mike J: Absolutely. Justin: Very cool, man. Well if you're all finished up, I want you to hop on out of there because I think it's my turn. I get to hop in, do another pull, and see what the numbers are. [engine noise] At the end of the Stage 1 Power Pack featuring our 2008 GT500, the car was making 508 horsepower and 479 pound feet of torque at the rear wheels. With all the Stage 2 modifications in the Power Pack installed, we were now putting down 548 horsepower and 545 pound feet of torque making for a gain of 40 horsepower over our Stage 1 numbers, and gains of 66 horsepower and 71 pound feet of torque throughout the curve. The Stage 2 Power Pack with pulley and supporting mods is always a favorite of GT500 owners, and I think it's pretty easy to see why. Honestly, there's nothing that compares to swapping those upper pulleys and really cranking up the boost. Hey, that's going to do it for the Stage 2 Power Pack Bolt-On Build-Up for all '07-'09 GT500's. Be sure to check out the other Power Packs for the GT500s and don't forget to subscribe to our YouTube channel if you haven't already. Thanks again for watching, and for everything Mustang, keep it right here at AmericanMuscle.com.

Eliminate Belt Slippage. Is belt slippage robbing your Shelby GT500 of power? Then reclaim it with a Metco Motorsports 90mm Double-Bearing Auxiliary Idler Pulley Kit from AmericanMuscle. The Metco idler pulley bolts up just to the left of the supercharger pulley allowing for maximizing belt wrap and to eliminate slippage.

Superior Materials. The 90mm double bearing idler pulley and mounting bracket included in this kit are CNC-machined from billet aluminum for superior strength and bolt directly to existing bolt bosses with no modifications required for installation.

Application. This Metco Supercharger Double-Bearing Idler Pulley Kit is specifically designed for use on the 2007 to 2014 Shelby GT500 Mustangs equipped with the Supercharged V8 engine, that have upgrade to a 2.4", 2.6" or 2.8" Metco Motorsports Supercharger pulley. Technical Note. Will not fit with Whipple 4.0L supercharger.

Fitment: 2007 2008 2009 2010 2011 2012 2013 2014 Details

What's in the Box
  • (1) 90mm Idler Pulley
  • (1) Mounting Bracket Plate
  • (3) Fastner bolts
Installation Info
Will it fit my Mustang?
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14

People Who Bought This Item Also Bought

Most Helpful Reviews

5/5
Metco auxiliar idler

Great product easy installation and looks good no belt slipping at all

Helpful (1)

5/5
Partth 2.6 Metco supercharger pulley 2008 GT500

A definite must when exchanging stock 3 " pulley for 2.6" pulley. Big performance gain

Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 10 Reviews

Customer Photos (5) Submit Your Photo

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5 Questions / 5 Answers

Ask a Question

comparison with single bearing Is having the double bearing better than the single bearing version?

GT500Fan

Helpful (2)
  • Yes 2 bearings make it more stable and giving you a longer lasting pulley.

    BxPony

Show 1 more answer

I can see in the product photos of this idler, a back side shot. There is an obvious adjustment "slot" for the pulley. Am I right in assuming this slot is so adjustment can be made to the pulley position to address the problem of the serpentine belts passing too close or even touching just below the idler? Is there a torque value for the idler pulley retention bolt again after adjustment or the use of "lock tight"? Do all pulley mounting frames ahve this adjustment slot? Thanks

KevinB

Helpful (0)

I have a 2007 gt500 and I am putting on a trinity tvs with 2.4 inch pulley. Will this work well with my setup?

Anonymous

Helpful (0)

I have a 2008 roush stage 3 mustang , have installed these parts from you ford hot cams ,headers ,cold air intake, bama tuner. at idle the idler make noise because of the cams will the auxiliary pulley kit take care of this problem ? and can I puy a smaller pulley on it to get more boost ?

Chuck

Helpful (0)
  • Unfortunately, this part does not work on ROUSH cars. Your motor is a 4.6L, this bracket is made for the 5.4L GT500 which use a totally different platform. You idlers should not be making noise regardless of cams or idle speed. I suggest you remove your supercharger belt and spin each pulley by hand. You will find one that is rough, loose or gritty feeling. Replace it. I have had issues with aftermarket billet pulleys where the bears keep failing prematurely. Stick to the boring factory pulleys, they last a lot longer. To get more boost, you need to buy a smaller supercharger pulley and a bigger idler pulley; trying looking at VMP Tuning for supercharger pulleys.

    AutoXRacer

Metco idler pulley kit I have a 2.6 pulley installed already with my tune after install of the idler pulley kit do i need to get my car re-tuned?

Jack08

Helpful (0)
  • No

    LFOG

Show 1 more answer

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Customer Reviews (10) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Afternoon

Installation Cost:$100-$250

  • Performance Gain 4.7 4.7
  • Fit 4.9 4.9



  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    February 22, 2017

    Partth 2.6 Metco supercharger pulley 2008 GT500

    A definite must when exchanging stock 3 " pulley for 2.6" pulley. Big performance gain

    Shelby08

    Year: 2008 Submodel: GT500

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    December 06, 2016

    Metco auxiliar idler

    Great product easy installation and looks good no belt slipping at all

    Mustangpower

    Year: 2007 Submodel: GT500

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    April 07, 2016

    Must Have

    Really good looking piece to get rid of that dreaded belt slippage.

    dvdjreign14

    Year: 2014 Submodel: GT500

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    August 28, 2015

    GT500 double bearing idler

    Product is made very well. Solid and sturdy on car. I rtv'd the spacers to hold in place while I put the bolts through. Have not had the chance to use with smaller pulley but will see then if it help with slipping. I am very pleased with my purchase. Metro has always made exceptional product.

    Bizzydawg

    Year: 2011 Submodel: GT500 Shafter, CA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    October 20, 2013

    Idler pulley install and performance

    We changed the blower pulley to 2.6 and had belt slippage with the stock belt so I installed the Metco Motorsports Idler pulley in about a half an hour and eliminated the belt slippage. Great looking polished aluminum, nice addition to the under hood look. SAE dyno 538hp 525 torque.

    Realdeal

    Year: 2008 Submodel: GT500 Columbus, OH, USA

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    September 09, 2013

    Great quality!

    This is a must have if you swap your stock pulley out for a metco pulley and want to reduce belt slippage. Very good quality and easy to install. Just 3 bolts and its on. Fits great and looks awesome under the hood. Very pleased!

    inkupop21

    Year: 2012 Submodel: GT500 El Paso, TX, USA

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    March 01, 2016

    Looking good

    Looks great on the car . Plan to purchase more parts from American muscle. I'm truly pleased!

    Bbc247

    Year: 2007 Submodel: GT500

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    April 21, 2014

    Excellent Aux Pulley

    Installed this Aux Pulley in conjunction with a smaller supercharger pulley. Provides more belt wrap around the SC pulley and helps to eliminate belt slippage. I'm very happy with the result. Aux pulley works great and looks good as well. Easy installation. A bit expensive, but I felt the extra bucks was worth it for the double bearing set-up. AM recommended this item and I'm glad they did. Thanks AM!

    Wolfeman

    Year: 2007 Submodel: GT500 Henderson, NV

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    April 16, 2014

    09 GT500 Idler Pulley Kit

    This is a must to install with the 2.60 Supercharger Pulley. Looks & works great. Easy to install.

    steffens10

    Year: 2009 Submodel: GT500 MN

    Helpful (0)

  • 4/5

    Installation Time: Less than 1 Hour

    September 23, 2013

    Metco Motorsports Auxillary Idler Pulley

    Installation was a breeze took maybe 15 minutes. Has eliminated all belt slippage from the smaller pulley. Great looking product and well made. Last but not least fast and reliable shipping from A&M.

    crack

    Year: 2008 Submodel: GT500 Fort Hood,Tx

    Helpful (0)

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