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  See more parts for Subaru Forester
Select the year of your Subaru Forester:
Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014
Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014 - Image 6 Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014 - Image 2 Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014 - Image 3 Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014 - Image 4 Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014 - Image 5 Go Fast Bits GFB Lightweight Underdrive Pulley Kit for Subaru WRX | STI 2008-2021 - 2014 - Image 6

If you're looking to give your Subaru a bit more pep in its step, check out the GFB Lightweight Pulley Kit. Made from tough aircraft-grade 6061-T6 aluminum, this kit is all about shedding weight where it counts—the crankshaft. You’ll notice quicker acceleration thanks to the reduced rotational mass, which really makes the engine come alive. It’s like swapping out for a lighter flywheel but without the hassle.

Most of these kits are underdriven, which means your accessories are spinning a bit slower. Sounds counterintuitive, right? But this actually cuts down on parasitic losses, letting your engine breathe a little easier. I’ve installed these on my own WRX, and the difference is noticeable. The engine feels more eager, and those revs come up faster.

Now, I get it—some folks worry about lightweight pulleys messing with their ride. But don't sweat it! GFB has done their homework, and the underdrive ratios are optimized to avoid any negative impact on your accessories. Plus, they’ve steered clear of those pesky harmonic issues that can crop up with some engines. Every kit is application tested, so you can rest easy knowing it won’t cause any long-term damage.

Fitment:

  • Subaru WRX | STI 2008-2021
  • Subaru Forester 2009-2013
  • Subaru Impreza 2002-2005 & 2008-2014
  • Subaru Legacy 2003-2009
  • Subaru Outback 2005-2006
  • Subaru STI 2004-2020
  • Subaru WRX 2004-2020

So if you’re ready to wake up your Subaru, this lightweight pulley kit might just be the ticket. It’s straightforward to install and will have you feeling the difference right away.

Other Part Numbers:
Go Fast Bits #gfb2014

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2009-2013
 Subaru Forester
2002-2005, 2008-2014
 Subaru Impreza
2003-2009
 Subaru Legacy
2005-2006
 Subaru Outback
2004-2020
 Subaru STI
2004-2020
 Subaru WRX

Go Fast Bits Banner

Who is Go Fast Bits?

It all started with the passion of John Adrian to create something that other aftermarket parts cannot produce. Most parts he encountered are either of low quality and are made out of inferior materials.

He decided to take matters into his own hands and started designing, testing, and developing parts that would help improve the performance of his vehicle. Using his own car as a personal testbed, he created products that other enthusiasts later noticed, which has become the start of Go Fast Bits.

Your Source of Performance Parts 

The company offers various performance parts such as boost controllers, blow-off valves, short shifters, pulley kits, and more. John Adrian also acts as the chief engineer of the company. Using his 35 years of experience manufacturing high-quality parts for the automotive industry that includes Original Equipment Manufacturers (OEM) parts, he was able to produce parts that meet the demands of his customers.

Quality Made Products

All their parts are meticulously made using the highest grade material available to ensure product durability and reliability. Each piece is manufactured to fit perfectly on the vehicle and tested to ensure optimum performance and nothing less.

Purchase Go Fast Bits Parts At Vivid Racing

If you are in the market for high-quality products that would help improve your vehicle's performance, then Go Fast Bits is a brand that you can trust. Their products are proven to deliver performance without compromising the daily drivability of your vehicle. Whether your car is used as a grocery getter or a weekend racer, Go Fast Bits has the right parts for you. 

To know more about the company, visit Vivid Racing and check out their parts list that fits your specific requirement.

Lifetime Warranty
We live in a throw-away society, conditioned by cheap products and frequently released new models to expect eventual failure and discard something when it stops working or is superseded. However, pride in workmanship and our commitment to quality means that when we put our name to something, we are also staking our reputation on it.

That’s why we back our products with the best Warranty in the business! You should expect a lifetime of use from a well-engineered product, so if your GFB product fails as a result of defective materials or faulty workmanship whilst you remain the original owner, we will repair or replace it.

If the fault occurred as a result of usage outside of the terms of the warranty, or you are not the original owner, fear not, we can still help you. You should never need to throw a GFB product away, as spare parts are available and won’t cost the earth.

To activate your warranty go to:
https://gfb.com.au/warranty/

Installation Instructions

Click to view the Installation Instructions here

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