GSC 3089-12 Exh Valve Guides for 08-11 BMW 335i N54 3.0L I6

Vehicle Fitment

• 2008-2011 BMW 335i Coupe/Sedan/Convertible (E90/E92/E93, N54 3.0L Twin Turbo I6, RWD)
• Fits BMW N54 3.0L inline-6 cylinder head applications using 12 exhaust valve guides
• Confirmed for E92 335i by multiple trusted BMW performance retailers
• ECS Tuning also associates this part number with BMW N55 3.0L and S55 3.0L engine applications, but the strongest repeated fitment naming in the source set is E92 335i / N54
• Do not assign broader 1 Series, 5 Series, X-platform, or M-platform fitment unless the exact cylinder-head compatibility is separately verified
• Position: Exhaust side
• Drivetrain confirmed: RWD for listed 335i chassis
• Fitment confirmed through 2011 for listed 335i application. 2012-2025 broader coverage unconfirmed at time of listing.

Features

• GSC Power-Division manganese bronze exhaust valve guide set
• Designed for BMW inline-6 turbo cylinder head service
• Stopper-style exhaust valve guide design
• Sold as a complete set of 12 guides
• Manufactured from manganese bronze
• Built for performance engine rebuilds and cylinder head preparation
• Suitable for valvetrain service during head overhaul
• Precision-machined construction for proper guide fitment
• Engine-specific internal component rather than a universal vehicle part
• Intended for use with compatible BMW inline-6 cylinder heads only

Specifications

• Part Number: 3089-12
• Brand: GSC Power-Division
• Product Type: Exhaust valve guide set
• Position: Exhaust
• Quantity: 12
• Material: Manganese bronze
• Style: Stopper style
• Primary confirmed application: BMW 335i inline-6 turbo cylinder head
• Engine family reference in source set: N54 3.0L twin turbo I6
• Installation Note: Cylinder head machine work and guide fitting required

Included Components

• 12x exhaust valve guides

Product Description

The GSC 3089-12 is a manganese bronze exhaust valve guide set for BMW inline-6 turbo cylinder head builds. Multiple trusted BMW and performance retailers consistently identify this part number as a set of 12 exhaust valve guides for the BMW E92 335i application, making it an engine-side valvetrain service component rather than a general bolt-on vehicle part. The fitment evidence most consistently points to the N54 3.0L twin-turbo inline-6 used in the 2008-2011 BMW 335i range.

This set uses manganese bronze construction and stopper-style guide design for exhaust-side cylinder head service. It is intended for performance rebuilds, machine-shop head preparation, and valvetrain restoration where precise guide fitment is required. One source also maps the same part number to BMW N55 3.0L and S55 3.0L applications, but that broader engine-family coverage was not as consistently repeated across the source set, so it should not be published as primary vehicle fitment without additional confirmation.

This product does not change vehicle ride height, so no front or rear lift/drop height applies. Because this is an internal engine component, installation should be performed with proper cylinder head machining and valve-guide fitting procedures. Fitment confirmed through 2011 for the listed 335i application; broader 2012-2025 coverage remains unconfirmed at time of listing.