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SKU: 2023-8
GSC P-D 4B11T 23-8N Chrome Polished Exhaust Valve - 30mm Head (+1mm) - SET 8 for 2008-2015 Mitsubishi Lancer Evolution X
GSC Power-Division exhaust valves deliver reliable performance for the 4B11T engine in 2008-2015 Mitsubishi Lancer Evolution X models. This set of 8 features a 30mm head diameter with +1mm oversize for greater exhaust flow during high-RPM and boosted operation. The chrome polished finish and 23-8N stainless steel construction handle extreme heat in Evo X builds.
Key Features
- 23-8N Stainless Steel: Forged one-piece design withstands high exhaust gas temperatures in turbocharged 4B11T engines
- Chrome Polished Finish: Improves heat dissipation and resists carbon buildup for longer valve life
- 30mm Head Diameter (+1mm): Increases exhaust flow over stock for better top-end power and response
- 5.95mm Stem Diameter: Matches OEM guides with precise tolerances for secure fit and sealing
- 108.67mm Overall Length: Direct replacement with 9mm tip length and 2.5mm back-cut for coil spring compatibility
Product Notes
- Pair with matching +1mm valve seats for proper clearance and sealing
- Inspect valve guides during installation for wear
- Packaged in protective GSC box to prevent damage
Installation Notes
- Professional installation recommended.
- Machine valve seats to accommodate +1mm oversize head diameter
- Compatible with GSC valve springs and retainers for 4B11T
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2015 | Mitsubishi | Lancer | Evolution X GSR |
| 2008-2015 | Mitsubishi | Lancer | Evolution X MR |
| 2008-2015 | Mitsubishi | Lancer | Evolution X Final |
Why Choose GSC Power-Division?
- Proven in professional racing Evo X engines worldwide
- Focus on valvetrain durability for high-boost reliability
- Precision CNC machining ensures consistent valve geometry
Frequently Asked Questions
-
Q: Will these valves fit my 2010 Evo X GSR?
A: Yes, these are direct replacements for all 2008-2015 Lancer Evolution X models with the 4B11T engine including GSR, MR, and Final Edition submodels -
Q: What material and finish are used?
A: Forged from 23-8N stainless steel with swirl polishing on the face and chrome polishing on the stem and head for heat resistance and sealing -
Q: What is the warranty and install advice?
A: GSC offers a limited lifetime warranty against defects. Professional installation required due to oversize head needing seat machining
Shipping & Handling
- Method: Standard ground shipping
- Availability: In stock - ships same or next business day
- Packaging: Secure GSC box approximately 12 x 8 x 2 inches
- Weight: 1.1 lbs
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