Whiteline Rear Diff Mount Inserts - Positive Power Kit — Fits 08+ Subaru WRX Hatch / 08-09 Subaru STi

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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Whiteline

Whiteline is the Australian leader in handling-focused suspension hardware — anti-sway bars, control arm bushings, alignment correction kits, and limited-slip differentials. Engineered for Subaru WRX/STI, Mitsubishi EVO, and modern performance platforms.

Watch in action

Whiteline Rear Differential Mount Inserts for Subaru WRX & STi (Positive Power Kit)

Optimize your Subaru WRX Hatchback (2008 onwards) and STi (2008-2009) performance with the Whiteline Rear Differential Mount Inserts, also known as the Positive Power Kit. This innovative kit works by inserting into the factory differential bushing, ensuring critical pinion angles are maintained while significantly reducing initial torque loss. The result is a more direct and efficient transfer of power to the wheels, leading to an improved gear shift feel and overall enhanced drivetrain response.

Key Features & Benefits:

  • Improved Power Transfer: Minimizes torque loss for quicker acceleration.
  • Maintained Pinion Angles: Crucial for drivetrain longevity and performance under load.
  • Enhanced Shift Feel: Contributes to a more precise and positive gear engagement.
  • Reduced Drivetrain Slop: Eliminates unwanted movement within the differential mount.
  • Durable Construction: Made from high-quality materials for lasting performance.
  • Direct Fit Inserts: Designed to complement the OEM bushing for easier installation.

This Whiteline kit is an ideal upgrade for Subaru enthusiasts looking to refine their car's performance, especially those who frequently engage in spirited driving, track days, or drag racing. By stabilizing the differential and improving power delivery, you'll experience a more responsive and connected drivetrain. The kit helps put power down more effectively, reducing hesitation and ensuring that your Subaru reacts instantly to throttle inputs. Installation is designed to be straightforward, making it a valuable addition for any performance-minded Subaru owner.

Experience superior drivetrain performance with Whiteline parts, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2008 Subaru Forester Sports 2.5 X
2008 Subaru Forester Sports 2.5 XT
2008 Subaru Forester X L.L. Bean Edition
2008-2010 Subaru Forester XT Limited
2008-2013 Subaru Forester X
2009 Subaru Forester XT
2009-2013 Subaru Forester X Limited
2009-2013 Subaru Forester X Premium
2010-2013 Subaru Forester XT Premium
2011-2013 Subaru Forester X Touring
2011-2013 Subaru Forester XT Touring
2014-2018 Subaru Forester 2.0XT Premium
2014-2018 Subaru Forester 2.0XT Touring
2014-2018 Subaru Forester 2.5i
2014-2018 Subaru Forester 2.5i Limited
2014-2018 Subaru Forester 2.5i Premium
2014-2018 Subaru Forester 2.5i Touring
2008-2011 Subaru Impreza 2.5i
2008-2011 Subaru Impreza Outback Sport
2008-2014 Subaru Impreza WRX
2008-2014 Subaru Impreza WRX STI
2009-2010 Subaru Impreza 2.5 GT
2009-2014 Subaru Impreza WRX Premium
2010 Subaru Impreza WRX STI Special Edition
2010-2011 Subaru Impreza 2.5i Premium
2010-2014 Subaru Impreza WRX Limited
2011-2014 Subaru Impreza WRX STI Limited
2012-2016 Subaru Impreza Sport Limited
2012-2016 Subaru Impreza Sport Premium
2012-2017 Subaru Impreza Base
2012-2017 Subaru Impreza Limited
2012-2017 Subaru Impreza Premium
2017 Subaru Impreza Sport
2004 Subaru Legacy L
2004 Subaru Legacy L 35th Anniversary
2004-2006 Subaru Legacy GT
2005 Subaru Legacy Limited
2005 Subaru Legacy GT Limited
2005 Subaru Legacy i
2006-2009 Subaru Legacy 2.5i
2006-2009 Subaru Legacy GT spec.B
2007-2009 Subaru Legacy 2.5i Limited
2007-2009 Subaru Legacy 2.5i Special Edition
2007-2009 Subaru Legacy GT Limited
2008-2009 Subaru Legacy 3.0 R Limited
2009 Subaru Legacy 3.0 R
2015-2019 Subaru Legacy 2.5i
2015-2019 Subaru Legacy 2.5i Limited
2015-2019 Subaru Legacy 2.5i Premium
2015-2019 Subaru Legacy 3.6R Limited
2017-2019 Subaru Legacy 2.5i Sport
2015-2019 Subaru Outback 2.5i
2015-2019 Subaru Outback 2.5i Limited
2015-2019 Subaru Outback 2.5i Premium
2015-2019 Subaru Outback 3.6R Limited
2017-2019 Subaru Outback 2.5i Touring
2017-2019 Subaru Outback 3.6R Touring
2015-2020 Subaru WRX Base
2015-2020 Subaru WRX Limited
2015-2020 Subaru WRX Premium

…and 14 additional fitments. Contact us to confirm yours.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Whiteline

Whiteline is the Australian leader in handling-focused suspension hardware — anti-sway bars, control arm bushings, alignment correction kits, and limited-slip differentials. Engineered for Subaru WRX/STI, Mitsubishi EVO, and modern performance platforms.

Watch in action

Whiteline Rear Differential Mount Inserts for Subaru WRX & STi (Positive Power Kit)

Optimize your Subaru WRX Hatchback (2008 onwards) and STi (2008-2009) performance with the Whiteline Rear Differential Mount Inserts, also known as the Positive Power Kit. This innovative kit works by inserting into the factory differential bushing, ensuring critical pinion angles are maintained while significantly reducing initial torque loss. The result is a more direct and efficient transfer of power to the wheels, leading to an improved gear shift feel and overall enhanced drivetrain response.

Key Features & Benefits:

  • Improved Power Transfer: Minimizes torque loss for quicker acceleration.
  • Maintained Pinion Angles: Crucial for drivetrain longevity and performance under load.
  • Enhanced Shift Feel: Contributes to a more precise and positive gear engagement.
  • Reduced Drivetrain Slop: Eliminates unwanted movement within the differential mount.
  • Durable Construction: Made from high-quality materials for lasting performance.
  • Direct Fit Inserts: Designed to complement the OEM bushing for easier installation.

This Whiteline kit is an ideal upgrade for Subaru enthusiasts looking to refine their car's performance, especially those who frequently engage in spirited driving, track days, or drag racing. By stabilizing the differential and improving power delivery, you'll experience a more responsive and connected drivetrain. The kit helps put power down more effectively, reducing hesitation and ensuring that your Subaru reacts instantly to throttle inputs. Installation is designed to be straightforward, making it a valuable addition for any performance-minded Subaru owner.

Experience superior drivetrain performance with Whiteline parts, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2008 Subaru Forester Sports 2.5 X
2008 Subaru Forester Sports 2.5 XT
2008 Subaru Forester X L.L. Bean Edition
2008-2010 Subaru Forester XT Limited
2008-2013 Subaru Forester X
2009 Subaru Forester XT
2009-2013 Subaru Forester X Limited
2009-2013 Subaru Forester X Premium
2010-2013 Subaru Forester XT Premium
2011-2013 Subaru Forester X Touring
2011-2013 Subaru Forester XT Touring
2014-2018 Subaru Forester 2.0XT Premium
2014-2018 Subaru Forester 2.0XT Touring
2014-2018 Subaru Forester 2.5i
2014-2018 Subaru Forester 2.5i Limited
2014-2018 Subaru Forester 2.5i Premium
2014-2018 Subaru Forester 2.5i Touring
2008-2011 Subaru Impreza 2.5i
2008-2011 Subaru Impreza Outback Sport
2008-2014 Subaru Impreza WRX
2008-2014 Subaru Impreza WRX STI
2009-2010 Subaru Impreza 2.5 GT
2009-2014 Subaru Impreza WRX Premium
2010 Subaru Impreza WRX STI Special Edition
2010-2011 Subaru Impreza 2.5i Premium
2010-2014 Subaru Impreza WRX Limited
2011-2014 Subaru Impreza WRX STI Limited
2012-2016 Subaru Impreza Sport Limited
2012-2016 Subaru Impreza Sport Premium
2012-2017 Subaru Impreza Base
2012-2017 Subaru Impreza Limited
2012-2017 Subaru Impreza Premium
2017 Subaru Impreza Sport
2004 Subaru Legacy L
2004 Subaru Legacy L 35th Anniversary
2004-2006 Subaru Legacy GT
2005 Subaru Legacy Limited
2005 Subaru Legacy GT Limited
2005 Subaru Legacy i
2006-2009 Subaru Legacy 2.5i
2006-2009 Subaru Legacy GT spec.B
2007-2009 Subaru Legacy 2.5i Limited
2007-2009 Subaru Legacy 2.5i Special Edition
2007-2009 Subaru Legacy GT Limited
2008-2009 Subaru Legacy 3.0 R Limited
2009 Subaru Legacy 3.0 R
2015-2019 Subaru Legacy 2.5i
2015-2019 Subaru Legacy 2.5i Limited
2015-2019 Subaru Legacy 2.5i Premium
2015-2019 Subaru Legacy 3.6R Limited
2017-2019 Subaru Legacy 2.5i Sport
2015-2019 Subaru Outback 2.5i
2015-2019 Subaru Outback 2.5i Limited
2015-2019 Subaru Outback 2.5i Premium
2015-2019 Subaru Outback 3.6R Limited
2017-2019 Subaru Outback 2.5i Touring
2017-2019 Subaru Outback 3.6R Touring
2015-2020 Subaru WRX Base
2015-2020 Subaru WRX Limited
2015-2020 Subaru WRX Premium

…and 14 additional fitments. Contact us to confirm yours.

Product Details

Product Description

About Whiteline

Whiteline is the Australian leader in handling-focused suspension hardware — anti-sway bars, control arm bushings, alignment correction kits, and limited-slip differentials. Engineered for Subaru WRX/STI, Mitsubishi EVO, and modern performance platforms.

Watch in action

Whiteline Rear Differential Mount Inserts for Subaru WRX & STi (Positive Power Kit)

Optimize your Subaru WRX Hatchback (2008 onwards) and STi (2008-2009) performance with the Whiteline Rear Differential Mount Inserts, also known as the Positive Power Kit. This innovative kit works by inserting into the factory differential bushing, ensuring critical pinion angles are maintained while significantly reducing initial torque loss. The result is a more direct and efficient transfer of power to the wheels, leading to an improved gear shift feel and overall enhanced drivetrain response.

Key Features & Benefits:

  • Improved Power Transfer: Minimizes torque loss for quicker acceleration.
  • Maintained Pinion Angles: Crucial for drivetrain longevity and performance under load.
  • Enhanced Shift Feel: Contributes to a more precise and positive gear engagement.
  • Reduced Drivetrain Slop: Eliminates unwanted movement within the differential mount.
  • Durable Construction: Made from high-quality materials for lasting performance.
  • Direct Fit Inserts: Designed to complement the OEM bushing for easier installation.

This Whiteline kit is an ideal upgrade for Subaru enthusiasts looking to refine their car's performance, especially those who frequently engage in spirited driving, track days, or drag racing. By stabilizing the differential and improving power delivery, you'll experience a more responsive and connected drivetrain. The kit helps put power down more effectively, reducing hesitation and ensuring that your Subaru reacts instantly to throttle inputs. Installation is designed to be straightforward, making it a valuable addition for any performance-minded Subaru owner.

Experience superior drivetrain performance with Whiteline parts, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2008 Subaru Forester Sports 2.5 X
2008 Subaru Forester Sports 2.5 XT
2008 Subaru Forester X L.L. Bean Edition
2008-2010 Subaru Forester XT Limited
2008-2013 Subaru Forester X
2009 Subaru Forester XT
2009-2013 Subaru Forester X Limited
2009-2013 Subaru Forester X Premium
2010-2013 Subaru Forester XT Premium
2011-2013 Subaru Forester X Touring
2011-2013 Subaru Forester XT Touring
2014-2018 Subaru Forester 2.0XT Premium
2014-2018 Subaru Forester 2.0XT Touring
2014-2018 Subaru Forester 2.5i
2014-2018 Subaru Forester 2.5i Limited
2014-2018 Subaru Forester 2.5i Premium
2014-2018 Subaru Forester 2.5i Touring
2008-2011 Subaru Impreza 2.5i
2008-2011 Subaru Impreza Outback Sport
2008-2014 Subaru Impreza WRX
2008-2014 Subaru Impreza WRX STI
2009-2010 Subaru Impreza 2.5 GT
2009-2014 Subaru Impreza WRX Premium
2010 Subaru Impreza WRX STI Special Edition
2010-2011 Subaru Impreza 2.5i Premium
2010-2014 Subaru Impreza WRX Limited
2011-2014 Subaru Impreza WRX STI Limited
2012-2016 Subaru Impreza Sport Limited
2012-2016 Subaru Impreza Sport Premium
2012-2017 Subaru Impreza Base
2012-2017 Subaru Impreza Limited
2012-2017 Subaru Impreza Premium
2017 Subaru Impreza Sport
2004 Subaru Legacy L
2004 Subaru Legacy L 35th Anniversary
2004-2006 Subaru Legacy GT
2005 Subaru Legacy Limited
2005 Subaru Legacy GT Limited
2005 Subaru Legacy i
2006-2009 Subaru Legacy 2.5i
2006-2009 Subaru Legacy GT spec.B
2007-2009 Subaru Legacy 2.5i Limited
2007-2009 Subaru Legacy 2.5i Special Edition
2007-2009 Subaru Legacy GT Limited
2008-2009 Subaru Legacy 3.0 R Limited
2009 Subaru Legacy 3.0 R
2015-2019 Subaru Legacy 2.5i
2015-2019 Subaru Legacy 2.5i Limited
2015-2019 Subaru Legacy 2.5i Premium
2015-2019 Subaru Legacy 3.6R Limited
2017-2019 Subaru Legacy 2.5i Sport
2015-2019 Subaru Outback 2.5i
2015-2019 Subaru Outback 2.5i Limited
2015-2019 Subaru Outback 2.5i Premium
2015-2019 Subaru Outback 3.6R Limited
2017-2019 Subaru Outback 2.5i Touring
2017-2019 Subaru Outback 3.6R Touring
2015-2020 Subaru WRX Base
2015-2020 Subaru WRX Limited
2015-2020 Subaru WRX Premium

…and 14 additional fitments. Contact us to confirm yours.

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