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Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit (Part Number: )
Go Fast Bits Underdrive Pulley Kit
Subaru Models (inc. 2008-2014 WRX / 2008+ STI)
Read 3 Reviews | 16 Q&As
Part # 2014
$301.91
msrp: $335.45

Only 3 left!

Features & Product Details

This GFB Pulley Kit comes with the crank, alternator and power steering pulleys as well as the belt needed for install. Having large heavy pulleys spinning takes away power that is better spent moving the car. This kit takes care of that by replacing the crank pulley with a lighter version that underdrives the power steering and alternator yet leaves the A/C compressor spinning at normal speeds.

Stock Crank Pulley : 5.51lb (STI) / 4.63lb (WRX)
GFB Crank Pulley : .86lb

Stock Power Steering Pulley : .81lb
GFB Power Steering Pulley : .37lb

Stock Alternator Pulley : .36lb
GFB Alternator Pulley : .14lb

Total Mass for GFB Pulley Kit : 1.38lb
Total Mass for Stock Pulleys : 6.69lb (STI) / 5.81lb (WRX)
Mass Savings : 5.31lb (STI) / 4.43lb (WRX)

Alternator Underdrive : 16.5%
Power Steering Underdrive : 18%
A/C Underdrive : None

Specifications

Brand: Go Fast Bits
Color: Black
Location: Crank, Alternator and Power Steering
Material: Aluminum
Pulley Ratio: Underdrive
Weight: Multiple
Belt Included: Yes
Mfgr. Warranty: 1 Year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days


Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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REVIEWS & CUSTOMER MEDIA

3 Reviews
5 out of 5 Stars
5 Stars
(3)
4 Stars
(0)
3 Stars
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2 Stars
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1 Stars
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Customer Photos and Videos
No user media. You can upload a photo or video of your install by posting a review.
Great Upgrade! 1 year ago
Qspeed
Looks Great! Really Light! I Really Like it!
  
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Impressive! 4 years ago
DannySTi
This kit will leave you astonished! It is super high quality and light weight... I had the perrin light weight installed on my 2008 STi and it was really good. I found the Go Fast Bits kit by accident and I kept thinking.... Hmm would 3 light weight pulleys be better than one? Sure is! Plus the quality and looks defineyely stands out. I love this kit, you'll feel the difference even going from one light weight pulley to this complete kit.. Now if you're in the market for a light weight pulley don't even look further.. this is the right kit to go with! Drive safe lol
  
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Why do just 1 pulley when you can replace them all?  5 years ago
WesD
The GFB pulley kit replaces the Crank, PS, and Alt pulley's with lightweight aluminum units that are of the highest quality. The real benefit is weight savings and when I weighed them in comparison to their stock counterparts I confirmed RSD's findings of more than a 5lb total weight savings on my 2008 STi. Comes with belts and install instructions. Oh and the packaging is damn impressive too! Buy them now!
  
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QUESTIONS & ANSWERS

  • Q: Power Steering Pump Pulley Size  ecornell7 months ago

    Is the Power Steering Pump Pulley the same size as the stock? Height and Width?
    • 0 of 0 people found the following answer helpful

      A:  We do not have the specific measurements of this guy but it is smaller than the OEM pulley for sure and needs to only be used with this kit.

      Megan L. @ RallySport Direct 4 months ago  
        
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  • Q: Confused   Stephen10 months ago

    Why does it say it won't fit on a 2.5i when it's still an ej25 ? Is that true ? I am looking for upgrades and a full kit would help but don't want to waste money if it's true.
    • 0 of 0 people found the following answer helpful

      A:  Unfortunately, this is not a kit that GFB confirms to fit the 2.5i.

      Megan L. @ RallySport Direct 10 months ago  
        
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    • 0 of 0 people found the following answer helpful

      A:  Our 2.5i has an EJ253 opposed to the WRX and STi's EJ255. I'm not sure if this has anything to do with it but I'm hoping that a confirmed fit is possible as well. One of us has to try it eventually. 😂

      Streamline @
        
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  • Q: installation  luckitiluc3 years ago

    how long should it takes to install all 3pulleys? and is it better to remove the bumper?
    • 0 of 0 people found the following answer helpful

      A:  The install should typically take 1-2 hours and there is no need to remove the bumper.

      Brady R @ RallySport Direct 3 years ago  
        
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  • Q: fitting  luckitiluc3 years ago

    does this fit on a subaru sti 15?
    • 0 of 0 people found the following answer helpful

      A:  This kit does fit the 2015 STI as per the application list on the left hand side of the page.

      Connor M. @ RallySport Direct 3 years ago  
        
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  • Q: Harmonics?  MrFreeze4 years ago

    How will this pulley kit effect the harmonics with the engine?
    • 0 of 0 people found the following answer helpful

      A:  Engine harmonics will not be negatively affected with this pulley kit.

      Zach G. @ RallySport Direct 4 years ago  
        
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    • 0 of 0 people found the following answer helpful

      A:  As Zach says, the engine harmonics are not an issue when using this pulley kit. There is more technical information on this topic available on our website: http://www.gfb.com.au/tech/faqs/21-pulley-kits/45-what-is-a-harmonic-balancer

      GFB @ Go Fast Bits 4 years ago  
        
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This Part Fits

Subaru Impreza
WRX Hatchback
2008 Subaru Impreza WRX Hatchback
2009 Subaru Impreza WRX Hatchback
2010 Subaru Impreza WRX Hatchback
2011 Subaru Impreza WRX Hatchback
2012 Subaru Impreza WRX Hatchback
2013 Subaru Impreza WRX Hatchback
2014 Subaru Impreza WRX Hatchback
WRX Limited Hatchback
2010 Subaru Impreza WRX Limited Hatchback
2011 Subaru Impreza WRX Limited Hatchback
2012 Subaru Impreza WRX Limited Hatchback
2013 Subaru Impreza WRX Limited Hatchback
2014 Subaru Impreza WRX Limited Hatchback
WRX Limited Sedan
2010 Subaru Impreza WRX Limited Sedan
2011 Subaru Impreza WRX Limited Sedan
2012 Subaru Impreza WRX Limited Sedan
2013 Subaru Impreza WRX Limited Sedan
2014 Subaru Impreza WRX Limited Sedan
WRX Premium Hatchback
2010 Subaru Impreza WRX Premium Hatchback
2011 Subaru Impreza WRX Premium Hatchback
2012 Subaru Impreza WRX Premium Hatchback
2013 Subaru Impreza WRX Premium Hatchback
2014 Subaru Impreza WRX Premium Hatchback
WRX Premium Sedan
2010 Subaru Impreza WRX Premium Sedan
2011 Subaru Impreza WRX Premium Sedan
2012 Subaru Impreza WRX Premium Sedan
2013 Subaru Impreza WRX Premium Sedan
2014 Subaru Impreza WRX Premium Sedan
WRX STI Hatchback
2008 Subaru Impreza WRX STI Hatchback
2009 Subaru Impreza WRX STI Hatchback
2010 Subaru Impreza WRX STI Hatchback
2011 Subaru Impreza WRX STI Hatchback
2012 Subaru Impreza WRX STI Hatchback
2013 Subaru Impreza WRX STI Hatchback
2014 Subaru Impreza WRX STI Hatchback
WRX STI Limited Hatchback
2011 Subaru Impreza WRX STI Limited Hatchback
2012 Subaru Impreza WRX STI Limited Hatchback
2013 Subaru Impreza WRX STI Limited Hatchback
2014 Subaru Impreza WRX STI Limited Hatchback
WRX STI Limited Sedan
2011 Subaru Impreza WRX STI Limited Sedan
2012 Subaru Impreza WRX STI Limited Sedan
2013 Subaru Impreza WRX STI Limited Sedan
2014 Subaru Impreza WRX STI Limited Sedan
WRX STI Sedan
2011 Subaru Impreza WRX STI Sedan
2012 Subaru Impreza WRX STI Sedan
2013 Subaru Impreza WRX STI Sedan
2014 Subaru Impreza WRX STI Sedan
WRX STI Special Edition Hatchback
2010 Subaru Impreza WRX STI Special Edition Hatchback
WRX Sedan
2008 Subaru Impreza WRX Sedan
2009 Subaru Impreza WRX Sedan
2010 Subaru Impreza WRX Sedan
2011 Subaru Impreza WRX Sedan
2012 Subaru Impreza WRX Sedan
2013 Subaru Impreza WRX Sedan
2014 Subaru Impreza WRX Sedan