SKU: 12999-AK005 | UPC: 4957266620991
HKS PULLEY 8Rib-100mm for 2008-2021 Subaru WRX STI
This HKS 8-rib 100mm idler pulley fits 2008-2021 Subaru Impreza WRX STI models equipped with HKS GT2 supercharger kits. It maintains proper belt tension for smooth operation under high boost. Lightweight construction cuts rotational mass to support faster supercharger spool and consistent power delivery.
Key Features
- 8-Rib Design: Matches high-torque 8-rib belts to prevent slippage in 500+ whp setups
- 100mm Diameter: Sized for HKS GT2 superchargers to balance RPM and belt wrap
- Aluminum Build: Weighs only 430g to lower inertia and improve throttle response
- Anodized Finish: Resists wear corrosion and heat for extended track use
- Bolt-On Fit: Direct replacement using existing HKS tensioner hardware
Product Notes
- Requires HKS GT2 Supercharger Kit Type-R for compatibility
- Inspect belt condition during replacement to avoid premature wear
- Packages in foam-protected box measuring 5in x 5in x 2in
Installation Notes
- Professional installation recommended.
- Remove supercharger belt and loosen tensioner arm before swap
- Uses stock HKS mounting bolts no additional hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2014 | Subaru | Impreza WRX STI | All |
| 2008-2014 | Subaru | Impreza WRX STI | Hatchback |
| 2008-2014 | Subaru | Impreza WRX STI | Sedan |
| 2015-2021 | Subaru | WRX STI | All |
| 2015-2021 | Subaru | WRX STI | Hatchback |
| 2015-2021 | Subaru | WRX STI | Sedan |
Why Choose HKS?
- Motorsport heritage from Japanese rally and drift programs
- CNC-machined parts for exact tolerances and balance
- Proven reliability in 1000hp supercharged builds
Frequently Asked Questions
- Q: Will this pulley fit my 2015 STI with HKS supercharger?
A: Yes it bolts directly to 2008-2021 STI GT2 kits no modifications required - Q: What material is the pulley made from?
A: 6061 aluminum alloy with black anodized coating for heat and friction resistance - Q: What is the warranty on this part?
A: Backed by HKS one-year limited warranty against defects covers manufacturing issues
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Secure foam-lined box 5 x 5 x 2 inches
- Weight: 1.1 lbs shipping weight
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