Supertech Subaru WRX/STi 16V Dual Valve Spring Kit

The SPRK-TS1015-SU4 kit from Supertech uses a dual spring design, meaning each valve gets two springs working together. This setup is crucial for high-performance Subaru WRX and STi engines, especially when you're upgrading to more aggressive camshafts or increasing boost pressure. These dual springs are built to handle the increased stress and higher RPMs these engines can achieve, preventing valve float and ensuring reliable operation under demanding conditions. The springs are made from a high-tensile chrome-silicon wire, a material known for its strength and ability to maintain its spring rate over many cycles, even at elevated temperatures.

This kit is specifically designed for the 16-valve Subaru Boxer engines found in WRX and STi models. The dual spring configuration offers a significant advantage over single springs by providing better dampening and a more stable valve train. This means your valves will close more consistently and accurately, which is essential for maintaining proper combustion and preventing damage at high engine speeds. Supertech has a solid reputation for producing well-built internal engine components, and this valve spring kit is no exception. They are a popular choice for tuners and builders looking to extract more performance and reliability from their Subaru engines.

When installing this kit, remember that it's part of a larger engine build. You'll typically be working on the cylinder heads, and proper installation is key to achieving the intended performance and longevity. Ensure you follow the manufacturer's recommended installation procedures carefully, as valve spring installation requires specific tools and attention to detail to avoid damaging the springs or the cylinder head. This kit is intended for enthusiasts looking to push their Subaru's performance envelope safely and effectively.