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

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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

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) 90mm Idler Pulley
    • (1) Mounting Bracket Plate
    • (3) Fastner bolts
    Installation Info
    Tech Specs
    Will it fit my Mustang?

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    Customer Photos (9) Submit Your Photo

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    Questions & Answers (6)

    5 Top Rated Questions

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

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

    Helpful (2) Show 1 more answer

    Does this product fit a Kenne Bell 2.8 water cooled super charger?

    • The Metco Motorsports Auxiliary Idler Pulley Kit is designed for the factory supercharger on the GT500

    Helpful (0)

    Can you use this with a Whipple supercharger?

    • 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. It will not fit with a 4.0L Whipple supercharger.

    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?

    • Yes it will work with your 2.4" pulley setup.

    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 ?

    • 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.

    Helpful (0)
    Post Your Question
    1 More Question
    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? 2 answers

    People Who Bought This Item Also Bought

    Customer Reviews (23) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Afternoon

    Installation Cost:$100-$250

    • Performance Gain 4.521739 4.5
    • Fit 4.782609 4.8



    • 1/5

      Installation Time: Less than 1 Hour

      August 23, 2018

      Works as advertised

      This product works great if you have a GT500, but it doesn't match up on the hardware side when it comes to a 2013 ROUSH Charged GT.

      Scott

      Year: 2013 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      July 09, 2018

      2013 Shelby GT500

      Easy Easy Easy to install, unless you drop a bolt. It took me at least two hours to find that dang thing. Looks good on the front of the motor, makes everything look like it needs a polish.

      662Horsepower

      Year: 2013 Submodel: GT500

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 03, 2018

      Works

      Works like it should. The install was quick and easy

      JamesH

      Year: 2011 Submodel: GT500

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      May 21, 2018

      GT500 Metco Auxiliary Idler Pulley

      Installed Metco Motorsports Auxiliary Idler Pulley w/ 2.6" SuperCharge Pulley. Looks great and works even better. Love them. Removed coolant hoses for better access. Change coolant (had 29K on my '08 Shelby GT500). Also did Ford Performance Twin 65mm Throttle Body and Autolite Racing Spark Plugs. Already had AiRaid Coldair Intake and FlowMaster Axle Back Exhausts. Then Tuned it w/Bama Bluetooth iTSX and my iPad. I saw 14-15 psi boost in 3and4 gear. WOW!

      DouglasS

      Year: 2008 Submodel: GT500

      Helpful (3)

    • 5/5

      March 15, 2018

      Works good

      I put on both in about two hours and look great also winding sound

      Starglitch

      Year: 2010 Submodel: GT500

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      March 03, 2018

      Easy Install - Works Great

      After a dyno test, it was discovered my belt was slipping with a new Steeda super charger pulley installed by previous owner. I installed the Metco auxiliary idler pulley and a new stock belt and gained 10hp and eliminated all slippage. It looks great too. I would have been even happier if the install bolts would have been hex head instead of allen head since the bottom bolt is difficult to reach.

      Leon

      Year: 2007 Submodel: GT500

      Helpful (5)

    • 5/5

      Installation Time: Afternoon

      February 22, 2018

      Very quick and easy install

      Installed this idler along with my 2.3 TVS and have yet to have any belt slip issues.

      GeorgeC

      Year: 2012 Submodel: GT500

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      February 15, 2018

      Nice idler pulley!

      Super nice idler pulley. Looks fantastic. Easy install (just three bolts), but do yourself a favor... Disconnect and pull the coolant hoses out of the way. It'll save you the hassle of fighting them the whole time. Most people pair it up with the Metco 2.6 SC pulley, but I'm using it with a VMP 2.5 pulley. Works great.

      KenW

      Year: 2012 Submodel: GT500

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      December 12, 2017

      Looks Great

      This was a super easy install and looks great while doing what it is supposed to do....eliminate belt slippage.

      ShawnA

      Year: 2011 Submodel: GT500

      Helpful (6)

    • 5/5

      Installation Time: Less than 1 Hour

      December 01, 2017

      Metco Motorsports Auxiliary Idler Pulley Kit

      Perfect fit and Quality is Very good! Before install the supercharger belt would slip upon hard acceleration...not anymore!! Pair this up with a good quality Gates or Gatorback serpentine belt and both will outlast the supercharger and car! A must if you have increased the boost or changed out the supercharger pulley for more output! Thanks for a solution to my problem!!

      Grabber

      Year: 2010 Submodel: GT500

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      June 29, 2017

      Nice ...keep tight the belt for spin

      All is good the only you guys need to do is open the middle and put little grase ..ready.

      LuisO

      Year: 2014 Submodel: GT500

      Helpful (7)

    • 5/5

      Installation Time: Afternoon

      June 14, 2017

      Stage 2 Install

      First, this pulley is not adjustable! In the photos of this pulley on the website it shows a slot to allow adjustment of the pulley BUT in the information about the pulley it does NOT state adjustable. However, the build and ease of install are great. To those that may be intimidated as I was about the loosening off the S/C belt, it nothing at all. Simply put a breaker or longer ratchet in the 1/2 inch square hole of the tensioner, turn pulley counter clockwise. As belt loosens take it over the S/C drive pulley. Done. Don't get your fingers between the belt and pulley!! Quality of hardware and double bearing are great.

      KevinB

      Year: 2012 Submodel: GT500

      Helpful (7)

    • 5/5

      Installation Time: Less than 1 Hour

      May 05, 2017

      Easy installation and looks great.

      Simple install if you follow the directions!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

      AndyJ

      Year: 2008 Submodel: GT500

      Helpful (5)

    • 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 (7)

    • 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 (7)

    • 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 (8)

    • 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 (6)

    • 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 (6)

    • 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 (5)

    • 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 (5)

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