SKU: 15009-AK006 | UPC: 4957266655627
HKS RADIATOR CAP S-Type for 2002-2021 Subaru WRX STI Nissan 350Z 370Z Honda S2000
The HKS Radiator Cap S-Type delivers 1.3 kgf/cm² pressure to maintain coolant flow and raise boiling point for reliable cooling under load. This direct replacement fits popular performance vehicles like Subaru Impreza WRX STI Nissan 350Z 370Z and Honda S2000. It prevents overflow and supports higher boost levels in tuned engines.
Key Features
- 1.3 kgf/cm² Pressure: Higher than stock 1.1 kgf/cm² rating keeps coolant under pressure to boost boiling point by up to 10°C and reduce air intrusion
- Anodized Aluminum Body: Corrosion-resistant finish with 36mm outer diameter and 42mm height ensures long-term durability in harsh conditions
- Fluoro Rubber Seal: High-temperature resistant gasket provides airtight seal against leaks and pressure loss over time
- Stainless Steel Spring: Precise tension maintains consistent performance during repeated heat cycles
- Lightweight Design: Only 64 grams for minimal impact while offering full OEM compatibility
Product Notes
- Inspect seal annually and replace every 2 years for peak performance
- Use with standard ethylene glycol or HKS coolants for best results
- Packaged in protective box to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Drain cooling system completely before removal to avoid spills
- Hand tighten plus quarter turn no additional tools or hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2004-2021 | Subaru | Impreza | STI |
| 2003-2008 | Nissan | 350Z | All |
| 2009-2020 | Nissan | 370Z | All |
| 2003-2009 | Honda | S2000 | All |
| 2003-2007 | Infiniti | G35 | Coupe/Sedan |
| 2003-2005 | Mitsubishi | Lancer | Evolution VIII |
| 2006-2015 | Mitsubishi | Lancer | Evolution IX/X |
Why Choose HKS?
- Established 1973 leader in JDM tuning with motorsport pedigree
- Engineered and tested for high-performance street and track use
- Consistent quality trusted by professional racers and enthusiasts
Frequently Asked Questions
- Q: Does this fit 2006 Subaru STI?
A: Yes direct replacement for 2004-2021 STI models with standard radiator neck - Q: What seal material is used?
A: Fluoro rubber resists heat up to 200°C and coolant chemicals for reliable sealing - Q: How hard is installation?
A: Bolt-on process takes 10 minutes after draining coolant no special tools required
Shipping & Handling
- Method: UPS Ground / USPS Priority Mail
- Availability: In stock – ships same or next business day
- Packaging: Protective cardboard box 4 x 3 x 2 inches
- Weight: 0.14 lbs product / 0.4 lbs shipping
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