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SKU: 7027S1 | UPC: GSC7027S1
GSC P-D Subaru EJ20 JDM Euro Spec STI S1 Cams 268/266 Billet 2002-2007 Impreza WRX STI
GSC Power-Division S1 camshafts deliver precise engineering for JDM and Euro spec Subaru EJ20 turbo engines in STI S1 models. Intake duration of 268 degrees and exhaust of 266 degrees produce strong mid to high RPM power gains up to 25hp while keeping smooth idle and daily drivability. Ideal for track days or spirited street driving on 2002-2007 Impreza WRX STI JDM chassis like GDB with EJ207 variant.
Key Features
- Billet 8620 Cores: High-strength alloy steel hardened to 60 Rockwell C for reliability under boost and high RPM
- Duration Specs: 268 intake 266 exhaust at 1mm lift for broad powerband from 4500-8500 RPM
- Lift Values: 10.60mm intake 10.03mm exhaust optimized for stock valve springs on low boost setups
- Profile Design: Dyno-tested for 20-25whp gains over stock cams with improved throttle response
- Precision Ground: CNC ground lobes ensure perfect valve timing and longevity in turbo applications
Product Notes
- Not compatible with USA spec engines due to valve angle differences
- Pair with upgraded timing belt and tensioner for best results
- Ships in protective foam-lined box to prevent damage
Installation Notes
- Professional installation recommended.
- Verify valve to piston clearance before final assembly
- Compatible with OEM cam trays and bearings no modifications needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX STI JDM Euro Spec S1-S7 |
| 2001-2002 | Subaru | Impreza | WRX STI Type RA S201 |
| 2002-2004 | Subaru | Impreza | WRX STI Spec C S202 S203 |
| 2005-2006 | Subaru | Impreza | WRX STI Spec C S204 S205 |
| 2006-2007 | Subaru | Impreza | WRX STI Spec C Type RA S206 S207 |
Why Choose GSC?
- Proven in JDM racing with thousands of sets installed worldwide
- Cam profiles refined through real-world dyno and track testing
- Manufactured with tight tolerances for consistent performance
Frequently Asked Questions
-
Q: Will these cams fit USA market Subaru WRX STI engines?
A: No these are engineered only for JDM Euro spec EJ20 STI S1 engines due to unique valve geometry -
Q: What material construction do these camshafts use?
A: Billet 8620 alloy steel cores with nitrided surfaces for wear resistance and strength -
Q: Do I need upgraded valve springs for installation?
A: Stock springs work for up to 15psi boost higher boost requires springs like GSC S1 springs
Shipping & Handling
- Method: UPS Ground Free Shipping over $199
- Availability: In stock - ships same or next business day
- Packaging: Foam-lined custom box 20 x 6 x 6 inches
- Weight: 4.80 lbs
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