Brian Crower BC3915 Exhaust Valve Guides for 2008-2015 Mitsubishi Evo X 2.0L

Vehicle Fitment

• 2008-2015 Mitsubishi Lancer Evolution X (4B11T 2.0L I4 Turbo, AWD)
• 2010-2014 Hyundai Genesis Coupe (2.0T G4KF 2.0L I4 Turbo, RWD)

Fitment Notes

• Designed for Mitsubishi 4B11T and Hyundai G4KF (Theta II Turbo) engines
• Exhaust valve guide set only
• Compatible with OEM and oversized (+1mm) valve stems
• Recommended for high-performance, high-boost, and rebuilt cylinder heads

Features

• Manufactured from high-phosphorous bronze alloy for superior durability
• Significantly improved heat dissipation compared to OEM guides
• Reduces valve stem wear and friction under high load conditions
• Enhances valvetrain stability at high RPM
• Precision-machined 5.5mm internal diameter for exact fitment
• Improves lubrication characteristics for extended component life
• Minimizes risk of valve sticking and guide distortion
• Ideal for turbocharged, race, and high-performance engine builds

Specifications

• Component Type: Exhaust valve guides
• Material: High-phosphorous bronze alloy
• Inner Diameter: 5.5mm
• Compatibility: Standard and +1mm valve stems
• Engine Compatibility: 4B11T / G4KF 2.0L Turbo I4
• Position: Cylinder head (exhaust side)
• Application: Performance rebuild / high-boost engines
• Drivetrain: AWD / RWD

Included Components

• 8x Exhaust valve guides

Product Description

The Brian Crower BC3915 Exhaust Valve Guide Set is a critical upgrade for high-performance Mitsubishi 4B11T and Hyundai G4KF turbocharged engines. Designed using a high-phosphorous bronze alloy, these guides dramatically improve heat transfer away from the valve stems, reducing the risk of overheating, wear, and premature failure under extreme operating conditions. 

Unlike factory valve guides, which often struggle with thermal saturation and wear in high-boost environments, the BC3915 guides provide enhanced lubrication properties and superior dimensional stability. This results in improved valvetrain reliability, reduced friction, and longer service life. Ideal for engine builds pushing increased boost and RPM, these guides are a foundational upgrade for anyone seeking durability and performance from their Evo X or Genesis Coupe platform.