SR Performance Underdrive Pulleys (05-10 GT)

SR Performance Underdrive Pulleys (05-10 GT)
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Hey Im Justin with, and Im 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 compressor, water pump and alternator can really rob your car of horsepower, a great example of how much power an accessory can eat up is whenever you turn your cars AC on and instantly it feels a little more sluggish. This is referred to as parasitic drag. The idea of an underdrive pulley is to turn the different accessory pulleys at a different speed, using these different sized pulleys thus requiring less power from the motor to drive each accessory. This reduction in drag on the crank shaft should allow the motor to operate more efficiently, and essentially equate to more power at the rear wheels. The SR Performance kit includes a new water pump pulley along with a brand new crank pulley, and the hardware needed for the install. Both pulleys are SF5 certified and are constructed using lightweight aluminum. As an added bonus, that bright polished finish is sure to look good under the hood as well. As far as the install is concerned, you just want to leave yourself a couple of hours to get both pulleys installed. Ideally, you should have a torque wrench on hand as well as some high temp RTV sealant and a breaker bar for that crank pulley bolt. This isnt the hardest job in the world, but if youve never attempted it before, I really suggest watching the detailed instruction video located on this product page before getting started on the install. So be sure to check out the SR Performance underdrive pulleys right here at
OUR PRICE$164.95
Market Price $239.99You Save 31% ($75.04)
Item # 41131
(4.8/5)30 Reviews
Ships the same business day

Product Features

  • Free up horsepower
  • Complete kit
  • Durable, lightweight aluminum
  • Brilliant polished finish
  • Premium quality
  • Fits 05-10 GT and Bullitt

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.

Underdrive Pulley Specifications
Year/Model: 2005-2010 GT Manufacturer: SR Performance
Material: Aluminum Finish: Polished
Crank Pulley: One Piece Crank SFI Certified: Yes

Installation Time:

(approx) 2 Hours

Difficulty Level:

Advanced mechanical skills required.

What's in the box?

  • (1) Crank Pulley
  • (1) Water Pump Pulley
  • (1) Crank Bolt
  • (1) Instruction Sheet

What's in the box?

  • (1) Crank Pulley
  • (1) Water Pump Pulley
  • (1) Crank Bolt
  • (1) Instruction Sheet
  • GT 05, 06, 07, 08, 09, 10
  • Bullitt 08, 09

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