GSC Power-Division exhaust valves for the 4B11 Evo X. Exhaust valves are sold as a set of 8. Choose the standard modified 23-8N stainless material or 2000°F Super Alloy.
Vehicle Fitment:
Mitsubishi 4B11
2008-2015 Evolution X
GSC Exhaust Valves:
Super Alloy:
GSC Power-Division Super Alloy Exhaust Valves are for those running high horsepower, high EGT set ups that need a valve that will last in 2000°F conditions. The Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity, especially when paired with the GSC Manganese bronze valve guides. Strength, heat resistance, and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and back cut heads promote better air flow without sacrificing durability.
Vehicle Fitment:
Mitsubishi 4B11
2008-2015 Evolution X
GSC Exhaust Valves:
| Part Number: | Head Diameter Size: | Material: | Quantity: |
| GSC 2021-8 | STD Size (29mm) | 23-8N | Set of 8 |
| GSC 2025-8 | STD Size (29mm) | Super Alloy | Set of 8 |
Super Alloy:
GSC Power-Division Super Alloy Exhaust Valves are for those running high horsepower, high EGT set ups that need a valve that will last in 2000°F conditions. The Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity, especially when paired with the GSC Manganese bronze valve guides. Strength, heat resistance, and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and back cut heads promote better air flow without sacrificing durability.