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SKU: LSD 184 C | UPC: 4996338017222
Cusco LSD RS1 Front GDB GRB GVB STI Impreza 2002-2014
Cusco LSD RS1 Front is a clutch-type limited slip differential for Subaru Impreza WRX STI GDB GRB GVB chassis including 2004-2007 USDM STI and JDM variants. This 1-way LSD sends power evenly to both front wheels under acceleration for better traction and corner exit speed. Direct bolt-in replacement matches OEM 10.5-inch ring gear for easy install on track or street cars.
Key Features
- 1-Way Torque Sensing Design: Engages during acceleration with 45-degree cam angle for smooth power delivery and lockup under load delivering consistent traction out of corners.
- 8 Clutch Plates: High-capacity clutch pack with adjustable initial torque set at 15kgf-cm standard for tuning to track or daily driving needs.
- 10.5-Inch Ring Gear: Matches OEM specifications for direct bolt-in fit without axle or housing modifications.
- Precision Forged Gears: Chromoly steel bevel gears handle high horsepower up to 500hp with resistance to wear and heat.
- Lightweight Construction: Weighs 22 lbs to cut unsprung weight for sharper suspension response and improved chassis balance.
Product Notes
- Requires Cusco LSD oil LS-M1 for optimal clutch performance and longevity.
- Initial break-in period of 30 minutes recommended before full load use.
- Ships in protective foam-lined box measuring 15x15x15 inches.
Installation Notes
- Professional installation recommended.
- Drain and inspect OEM differential housing before install.
- Includes all necessary gaskets and hardware for direct fit into STI front diff.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX STI GDB |
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2007 | Subaru | Impreza | WRX STI Limited |
| 2007-2011 | Subaru | Impreza | WRX STI GRB |
| 2008-2014 | Subaru | Impreza | WRX STI GVB |
Why Choose Cusco?
- Trusted by rally teams worldwide for durable drivetrain components.
- Hand-assembled in Japan with strict quality controls.
- Proven in D1GP and Super Taikyu racing series.
Frequently Asked Questions
-
Q: Does this fit 2004-2007 USDM STI models?
A: Yes direct fit for GDB chassis Impreza WRX STI 2004-2007 including Limited edition with 10.5-inch front diff. -
Q: What material are the internals?
A: Forged chromoly steel gears and high-friction clutch plates built for high torque and heat resistance. -
Q: What is the warranty and install process?
A: 1-year manufacturer defect warranty. Install takes 4-6 hours with standard tools and diff drop.
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure double-boxed 15x15x15 inches
- Weight: 25 lbs shipped
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Cusco is a Japanese performance parts manufacturer with over 40 years of motorsports experience, producing coilovers, suspension braces, differentials, roll cages, and chassis reinforcement components for top sport compact and all-wheel-drive platforms. Cusco parts are built to motorsport tolerances and are used by professional race teams competing in Japanese domestic market racing series alongside street performance enthusiasts worldwide.Popular UpgradesCusco coilover kits, strut tower braces, and rear member braces are the most popular products for Subaru WRX and STI, Toyota 86 and GR86, Mazda Miata, Honda Civic, and Mitsubishi Evo platforms. Cusco limited-slip differentials and differential braces provide improved traction and reduced chassis flex for track and autocross builds on AWD platforms. Cusco adjustable control arms and camber kits allow precise alignment correction after lowering springs or coilovers are installed.What chassis bracing does Cusco make for the Subaru WRX...
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