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The HKS 15-21 Subaru WRX STI 6MT Carbon Shift Knob is designed for the 2004-2014 Subaru Impreza and the other applications in the fitment table. Match manufacturer part number 51999-AF001, the complete vehicle or system configuration, dimensions, connections, and included components before ordering.
Key Features
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2004-2014 | Subaru | Impreza | Confirm engine, body style, system configuration, and exact interface |
| 2015-2021 | Subaru | WRX | Confirm engine, body style, system configuration, and exact interface |
Specifications
| Brand | HKS |
|---|---|
| Manufacturer Part Number | 51999-AF001 |
| Product Type | Shift Knobs |
| Fitment Type | Vehicle Specific |
| Condition | New |
| Spherical section diameter | 47 mm |
| Material | Carbon fiber |
| Package dimensions | 55 x 55 x 80 mm |
| Package weight | 0.16 kg |
| Package Dimensions/Weight | 55 x 55 x 80 mm, 0.16 kg |
What's Included
One new HKS shift knobs identified by manufacturer part number 51999-AF001, in the quantity stated by the title. Additional wiring, pipes, hoses, clamps, fittings, gaskets, fluids, tuning, tools, and installation hardware are included only when expressly listed for this exact part number.
About HKS
HKS develops exhaust, forced-induction, cooling, engine, electronics, and exterior components for import and performance vehicle applications.
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Frequently Asked Questions
How do I confirm this HKS part is correct?
Match the exact manufacturer part number, dimensions, material, finish, quantity, electrical requirements, and connection or mounting interface before ordering.
Is this a complete kit?
Only the components stated in the title and What’s Included section are supplied. Related wiring, fittings, hoses, clamps, sensors, tools, or hardware may be sold separately.
Can this part be used in a custom application?
Universal parts may work when every dimension and interface is verified. Vehicle-specific or system-specific parts should not be treated as universal without current manufacturer confirmation.
Installation Instructions
Follow the current HKS instructions and the vehicle service manual for part number 51999-AF001. Compare every component, connection, dimension, and mounting point before disassembly. Use the correct tools, fasteners, torque values, fluids, wiring protection, and safety procedures, then inspect for leaks, interference, heat exposure, clearance, and secure operation before normal use.
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