HKS 51999-AF001 Carbon Shift Knob for 2004-2021 Subaru WRX STI 6MT

Vehicle Fitment

• 2004-2007 Subaru Impreza WRX STI (GDB, EJ257 2.5L H4 Turbo, AWD, 6MT)
• 2008-2014 Subaru Impreza WRX STI (GRB/GVB, EJ257 2.5L H4 Turbo, AWD, 6MT)
• 2015-2021 Subaru WRX STI (VAB, EJ257 2.5L H4 Turbo, AWD, 6MT)
• 2015-2021 Subaru WRX (VA, FA20DIT 2.0L H4 Turbo, AWD, 6MT)
• 2004-2007 Subaru Legacy GT Spec.B (BP5/BPE/BLE, AWD, 6MT)
• 2008-2012 Subaru Legacy B4 / Legacy Touring Wagon (BM9/BR9, AWD, 6MT)

Fitment Notes

• Fits Subaru 6-speed manual transmission applications utilizing M12x1.25 shift lever threads.
• Designed for vehicles with reverse gear located in the lower-right shift position.
• Not compatible with automatic transmissions.
• Not compatible with CVT-equipped WRX models.

Features

• Genuine HKS carbon fiber shift knob.
• Vehicle-specific Subaru 6MT application.
• Lightweight carbon fiber main body.
• Precision-machined aluminum collar.
• Red anodized accent ring.
• Optimized spherical ergonomic design.
• Improves shift feel and driver engagement.
• 47mm knob diameter for comfortable grip.
• Includes 6-speed shift pattern sticker.
• Motorsport-inspired HKS styling.

Specifications

• Brand: HKS
• Part Number: 51999-AF001
• Product Type: Carbon Shift Knob
• Thread Size: M12 x 1.25
• Knob Diameter: 47mm
• Material: Carbon Fiber / Aluminum
• Transmission Compatibility: 6-Speed Manual
• Reverse Position: Lower Right
• Color: Carbon Fiber with Red Anodized Accent
• Position: Interior Shift Lever
• Weight: Approximately 0.13 kg

Included Components

• 1x HKS Carbon Shift Knob
• 1x 6-Speed Shift Pattern Sticker

Product Description

The HKS 51999-AF001 Carbon Shift Knob is a premium interior upgrade developed specifically for Subaru 6-speed manual transmission applications. Constructed with a lightweight carbon fiber body and a precision-machined aluminum collar, it provides an enhanced tactile feel while adding a motorsport-inspired appearance to the vehicle interior. The integrated red anodized accent complements the factory STI and WRX interior design themes.

Featuring a 47mm spherical grip profile, the shift knob is engineered to deliver comfortable hand positioning and consistent shift engagement during both street and performance driving. The M12x1.25 thread pattern allows direct installation on compatible Subaru 6MT vehicles without modification. A matching 6-speed shift pattern emblem is included for a factory-quality finish.

This shift knob is intended for Subaru manual transmission platforms utilizing the traditional lower-right reverse lockout pattern. It is an ideal upgrade for WRX, STI, and select Legacy performance models seeking improved driver feel and authentic HKS styling.