Cusco LSD RS 1-Way Front Differential — Fits 2004-2007 Subaru Impreza STI

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SKU: CUSLSD 184 C
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About Cusco Cusco Japan engineers the strut-tower braces, sway bars, ...Read More

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Sale price$1,387.50 Regular price$1,480.00
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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 Cusco

Cusco Japan engineers the strut-tower braces, sway bars, alignment correction, and limited-slip differentials that power JDM and time-attack programs. The brand behind countless Time Attack and grassroots motorsport podiums.

Watch in action

Superior Front-End Grip with Cusco LSD RS 1-Way

The Cusco LSD RS 1-Way Front Differential is an essential upgrade for any Subaru Impreza STI owner looking to sharpen their vehicle's turn-in response. By locking only under acceleration, this 1-way differential allows for natural, predictable handling during corner entry, while providing maximum traction when you get back on the throttle. It is the preferred choice for drivers who want to eliminate front-wheel spin and improve overall vehicle balance.

Technical Advantages

  • 1-Way Locking: Provides a focused lock during acceleration, perfect for maintaining a tight line through corners.
  • RS Spring Technology: Features internal coil springs for a smooth, consistent, and durable locking experience.
  • Performance Focused: Specifically designed for the high-performance demands of the GDB, GRB, and GVB STI platforms.
  • Improved Turn-in: Helps the car rotate more effectively, reducing understeer in technical sections.

This differential is built to withstand the intense torque of the STI engine, ensuring that you can accelerate harder and earlier out of corners. With its high-quality construction and precision engineering, the Cusco RS series is the gold standard for Subaru drivetrain performance. Enhance your driving dynamics and achieve faster lap times with this premium component. Explore the full range of performance drivetrain solutions available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2007 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited

Product Details

Product Description
Part Numbers
Sizing & Fit

About Cusco

Cusco Japan engineers the strut-tower braces, sway bars, alignment correction, and limited-slip differentials that power JDM and time-attack programs. The brand behind countless Time Attack and grassroots motorsport podiums.

Watch in action

Superior Front-End Grip with Cusco LSD RS 1-Way

The Cusco LSD RS 1-Way Front Differential is an essential upgrade for any Subaru Impreza STI owner looking to sharpen their vehicle's turn-in response. By locking only under acceleration, this 1-way differential allows for natural, predictable handling during corner entry, while providing maximum traction when you get back on the throttle. It is the preferred choice for drivers who want to eliminate front-wheel spin and improve overall vehicle balance.

Technical Advantages

  • 1-Way Locking: Provides a focused lock during acceleration, perfect for maintaining a tight line through corners.
  • RS Spring Technology: Features internal coil springs for a smooth, consistent, and durable locking experience.
  • Performance Focused: Specifically designed for the high-performance demands of the GDB, GRB, and GVB STI platforms.
  • Improved Turn-in: Helps the car rotate more effectively, reducing understeer in technical sections.

This differential is built to withstand the intense torque of the STI engine, ensuring that you can accelerate harder and earlier out of corners. With its high-quality construction and precision engineering, the Cusco RS series is the gold standard for Subaru drivetrain performance. Enhance your driving dynamics and achieve faster lap times with this premium component. Explore the full range of performance drivetrain solutions available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2007 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited

Product Details

Product Description

About Cusco

Cusco Japan engineers the strut-tower braces, sway bars, alignment correction, and limited-slip differentials that power JDM and time-attack programs. The brand behind countless Time Attack and grassroots motorsport podiums.

Watch in action

Superior Front-End Grip with Cusco LSD RS 1-Way

The Cusco LSD RS 1-Way Front Differential is an essential upgrade for any Subaru Impreza STI owner looking to sharpen their vehicle's turn-in response. By locking only under acceleration, this 1-way differential allows for natural, predictable handling during corner entry, while providing maximum traction when you get back on the throttle. It is the preferred choice for drivers who want to eliminate front-wheel spin and improve overall vehicle balance.

Technical Advantages

  • 1-Way Locking: Provides a focused lock during acceleration, perfect for maintaining a tight line through corners.
  • RS Spring Technology: Features internal coil springs for a smooth, consistent, and durable locking experience.
  • Performance Focused: Specifically designed for the high-performance demands of the GDB, GRB, and GVB STI platforms.
  • Improved Turn-in: Helps the car rotate more effectively, reducing understeer in technical sections.

This differential is built to withstand the intense torque of the STI engine, ensuring that you can accelerate harder and earlier out of corners. With its high-quality construction and precision engineering, the Cusco RS series is the gold standard for Subaru drivetrain performance. Enhance your driving dynamics and achieve faster lap times with this premium component. Explore the full range of performance drivetrain solutions available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2007 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited

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