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SR Performance Underdrive Pulleys (05-10 GT)

40 Reviews
Our Price

$164.95

  • Item #41131
  • MPN# 41131

  • Market Price $239.99
  • You Save 31% ($75.04)
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Product Videos Customer Photos
Features
  • Free up horsepower
  • Complete kit
  • Durable, lightweight aluminum
  • Brilliant polished finish
  • Premium quality
  • Fits 05-10 GT and Bullitt
Description
Untap Hidden Horsepower. Don't let your accessories and A/C drain power from your 2005 - 2010 GT. By replacing your factory pulleys with this SR Performance underdrive pulley kit, you'll free up to 15 horsepower that's currently being drained by your accessories and put it back where it belongs - under your right foot. And best of all, you won't affect your vehicle's charging or cooling capacity in the process.

SFI Certified Design. If you're ready to take it to a track, you'll rest easy knowing these SR Performance pulleys are SFI Certified.

Premium Quality. Don't settle for inferior parts. These premium quality SR Performance pulleys are made from lightweight aluminum for durability and performance. Made using precise, state-of-the-art CNC manufacturing, you can count on these pulleys to perform at the highest level.

Easy Installation. This SR Performance Mustang Underdrive Pulley kit installs quickly and easily in under 2 hours with no modifications required.

Application. These SR Performance underdrive pulleys are specifically designed for use on the 2005 to 2010 GT and 2008 to 2009 Bullitt Mustangs.

Mustang Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
  • (1) Crank Pulley
  • (1) Water Pump Pulley
  • (1) Crank Bolt
  • (1) Instruction Sheet
Installation Info
Tech Specs
Underdrive Pulley Specifications
Year/Model: 2005-2010 GT Manufacturer: SR Performance
Material: Aluminum Finish: Polished
Crank Pulley: One Piece Crank SFI Certified: Yes
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10

Most Helpful Reviews Read All Reviews

Overall Rating 4.8/5 Write a Review
5/5
Great Bang for Your Buck

The pulleys look good,installation was a piece of cake,the only recomendation for the install is to get a M8-1.25x2 bolt to replace the alt stud,instead of cutting the stud for the waterpump pulley to

Read More
Helpful (8) (0)

5/5
Horsepower Increase

Awesome Product just as good BBK, without all the price. Just buy a new bolt instaed of cutting the one on your vehicle. Take your time, snap a picture of how your belt diagram, just in case.

Helpful (6) (0)

Videos

Hey I’m Justin with AmericanMuscle.com, and I’m breaking down these underdrive pulleys from SR Performance, fitting the 4.6L V8 motor found in all 2005-2010 Mustang GTs. Engine accessories like the AC View Full Transcript

Customer Photos (22) View All Customer Photos

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Q & A (8 Questions, 5 Answers) Ask a Question

Will this cause the A/C not to work?

Geoff365 Year: 2006 Model: GT

Question Resolved
Good Question (0) (0)
  • A/C still works great in my car and I've had these exact pulleys for years. No drawbacks in my opinion unless you're going supercharged then you don't need them.

    Helpful (0) (0)

    MarkL Year: 2006 Model: GT

Show 1 more answer

Is the crank pulley aluminum too?

JJ281 Year: 2007 Model: GT

Question Resolved
Good Question (0) (0)
  • It is actually steel, which I was happy about for strength, still lighter than the stock one though. Water pump pulley is aluminum.

    Helpful (0) (0)

    MarkL Year: 2006 Model: GT

What size serpentine belt will I need with the new pulleys? I have had these pulleys for a while (sitting in the box) and have heard horror stories about how they affect the alternator. My main concern is the size of the belt. I do know with the new pulleys I will need a shorter belt. Has anybody had to do this?? What size is the new belt??? Thanks

CHEETO Year: 2007 Model: GT

Question Resolved
Good Question (0) (0)
  • You will not need a different belt for these pulleys. I have had these exact pulleys for years now without a single problem, only gains. It's only replacing the crank and water pump pulleys so it doesn't cause alternator problems like previous years. These cars have a plenty big alternator from the factory so unless you're running a big audio system you shouldn't have problems. I noticed faster revs and more pep with these pulleys; easy install and a great bang for buck mod, don't bother if you plan on supercharging though because they require stock pulleys. Good luck

    Helpful (1) (0)

    Best Answer

    MarkL Year: 2006 Model: GT

Show 1 more answer

Reviews (40) Write a Review

  • 5 Stars .82 83%
  • 4 Stars .12 12%
  • 3 Stars .05 5%
  • 2 Stars 0 0%
  • 1 Stars 0 0%
4.8

out of 5 stars

40 Customers Recommend this Product

Installation Time:Afternoon

Installation Cost:0-$100

  • Performance Gain: 4.102564 4.1/5
  • Fit: 4.775 4.8/5
  • Bang For Your Buck: 4.589744 4.6/5
Filter By Sort By
  • 5/5 Yes, I recommend this product

    April 03, 2012

    Great Bang for Your Buck

    The pulleys look good,installation was a piece of cake,the only recomendation for the install is to get a M8-1.25x2 bolt to replace the alt stud,instead of cutting the stud for the waterpump pulley to clear. Noticed a slight power gain. Great product for the price.

    drmustang

    Year: 2006 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 3 N. Myrtle Beach SC

    Helpful (8) (0)

  • 5/5 Yes, I recommend this product

    February 27, 2012

    Horsepower Increase

    Awesome Product just as good BBK, without all the price. Just buy a new bolt instaed of cutting the one on your vehicle. Take your time, snap a picture of how your belt diagram, just in case.

    IndigoBlue

    Year: 2008 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Agoura Hills, CA

    Helpful (6) (0)

  • 5/5 Yes, I recommend this product

    January 27, 2012

    Fuel Millage

    The day after the install of the new pulleys, I took the car for a trip. I got 26- 28 mpg! I have never seen that before, so it clearly made a difference. I have since done a few more bolt-ons and together they have turned the car into a real handful! When I speed shift into second, hold on becouse she is going to pull sideways and then bark a hard 3rd! The pulleys were easy to install. I have already recommended that my friends to do the same. Cannot wait until the track opens to see the new times. Fastest pass has been 13.7 totally stock.

    supercross

    Year: 2010 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 4 Anderson Texas

    Helpful (9) (3)

  • 5/5 Yes, I recommend this product

    February 23, 2012

    Pulley = Epic Win

    Hardest part about getting these installed was finding a friend with all the parts. It was a helluva lot of fun putting these on, the instructions were right on point. Note: this WILL require removing some hoses so you will want to be aware of some possible dripping. I'd have to say the car is a bit more peppy, I'm able to do wonderful things in 1st gear with no gas... Great fun!

    AustinJim

    Year: 2008 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Austin, Tx

    Helpful (3) (0)

  • 3/5 Yes, I recommend this product

    March 05, 2012

    Price wise, better then other pulleys, power is ok

    I work at Mustang Specialties, I purchase this set for my personal 09 GT did a before and after dyno. made 316rwhp before the install. Install went smooth and everything fit no problem and looks great. went ahead and dyno'd the car after the install same day just an hour later. car made 320rwhp with the pulley install. So with no other changes at all on the car what so ever this car will give a dyno proven 4rwhp. For me its not worth it, the car on nitrous still ran the same time and mph 11.5X@118-119

    KOTSCHRIS

    Year: 2009 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2

    Helpful (9) (5)

  • 4/5 Yes, I recommend this product

    September 26, 2013

    Smooths out performance a bit, but don't expect miracles

    I recently had these UD pulleys installed alongside a set of FRPP 3.73 gears. They seem to have offset the slight (1-2 mpg) drop expected by jumping from 3.31 to 3.73 rear end, and overall the car feels like it runs a little smoother. The engine feels as though it revs a little freer as well. Install cost for the pulleys was $75. A solid mod and I would buy them again.

    TitanJC

    Year: 2007 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 The Woodlands, TX

    Helpful (2) (0)

  • 5/5 Yes, I recommend this product

    June 29, 2012

    SR Performance Underdrive Pulleys (05-10 GT)

    This was a simple install about 1+ hours to do, It looks great and there is a very noticable HP gain.

    BobD

    Year: 2008 Model: GT Driving Style: Show 'Stangs I have owned: 1 Selinsgrove, PA.

    Helpful (2) (0)

  • 3/5 Yes, I recommend this product

    December 01, 2011

    Great just a few things to watch out for..

    Pros- great power gain and is identical to the BBK pulleys..pretty easy install Cons- the bolt that is provided needs to be shorter or a has to have a spacer... (the bolt as is will run out of threads leave the crank pulley only half pressed on).. by adding a washer it allows the bolt to pull in the pulley more.... Other thing is I have to switch to a smaller serpentine belt because my tensioner was maxed out and was causing the belt to slip...

    DaminB

    Year: 2007 Model: GT Driving Style: Race 'Stangs I have owned: 3 OC

    Helpful (8) (5)

  • 4/5 Yes, I recommend this product

    May 18, 2012

    Power when you want with fuel savings

    The stang definitely feels quicker on it's feet and the lighter pulleys help deliver better gas mileage when you're not gunning it. Best of both worlds. I got this installed at a shop, total labor cost $190 for a 2 hour job but it was worth it because they had to shave off a certain stud because one of the pulleys sits too deep. I think this is a great bang for your buck. With increased gas mileage, the pulley will pay for itself in about 2 years. Not bad.

    Nitin

    Year: 2005 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Fremont, CA

    Helpful (2) (1)

  • 5/5 Yes, I recommend this product

    November 15, 2012

    Hit

    pulling accessories causes a lag and robs horse power and man does this give it back, its not a bang for your buck its a hit, hit the gas and you will feel all the go for your doe. I love it. Troy

    Troy469

    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 roanoke rapids nc

    Helpful (1) (1)

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