The Mazda FE3 16-valve engine is a solid platform for naturally aspirated or turbocharged performance builds. Known for its strong bottom end and high-flow cylinder head, the FE3 responds incredibly well to tuning. However, pushing it beyond factory limits demands upgrades to the valvetrain—starting with the valve springs. STK Performance offers a high-quality dual valve

The legendary Volkswagen ABF 2.0L 16V engine is renowned for its high-revving nature and motorsport pedigree. Whether you’re building a naturally aspirated screamer or a turbocharged street monster, upgrading the valvetrain is essential for maximizing performance. STK Performance offers industry-leading valve springs and forged performance valves tailored specifically for the ABF platform. Why Upgrade with

When building high-performance VAG engines, one critical yet often overlooked component is the valve spring. STK Performance has developed a range of uprated valve spring kits tailored for the demands of turbocharged and naturally aspirated VW/Audi Group (VAG) engines—including the Golf GTI Mk5, Mk6, Mk7 (EA113 & EA888 TFSI platforms), as well as the iconic

Covering 2.5 TFSI (TTRS, RS3) & 4-Cylinder 16V TFSI Applications When pushing the performance boundaries of modern Audi TFSI engines, valve train stability becomes critical. STK Performance offers a range of high-quality valve spring kits tailored for the most demanding Audi engines, including the legendary 2.5 TFSI inline-5 found in the Audi RS3 and TTRS,

For BMW performance enthusiasts and engine builders, the M50, M52, and M54 inline-6 engines have become iconic platforms for both naturally aspirated and forced induction applications. At STK Performance, we understand the importance of reliable valvetrain performance, especially in high-revving or turbocharged setups. That’s why we offer precision-engineered dual valve spring kits and forged stainless

The Toyota 3SGTE engine, known for its strength and tuning potential, is a favourite among motorsport and performance enthusiasts. Whether you’re building a high-boost street car or a dedicated track machine, upgrading the valve train is critical to unlock the engine’s full potential. STK Performance offers premium single valve spring kits specifically engineered for the

The Ford ST150, known for its rev-happy Duratec 2.0 engine, has become a popular platform for tuning and motorsport applications. Whether naturally aspirated or boosted, increased performance demands more from the valvetrain – particularly the valve springs. STK Performance offers a dedicated high-performance valve spring kit engineered specifically for the ST150, delivering durability, control, and

When it comes to extracting the maximum performance from Audi’s legendary 2.5 TFSI engines found in the RS3 and TTRS, upgrading the valvetrain components is crucial—especially when increasing boost, raising RPM limits, or upgrading camshaft profiles. One of the most critical elements in a high-performance valvetrain setup is the valve springs. This is where STK

Optimized Valvetrain Performance for Naturally Aspirated and Forced Induction Builds The Volkswagen VR6 AAA 12v engine is a beloved powerplant, known for its unique narrow-angle V6 layout and robust bottom end. However, as performance builds push beyond OEM limits, valvetrain reliability becomes a critical factor. STK Performance addresses this need with a purpose-built valve spring

Precision Engineering for Ultimate Reliability and Performance When it comes to enhancing the performance and reliability of your VW Polo CLS or CLP engine, upgrading the valve train is one of the most critical steps. STK Performance offers high-quality valve spring kits specifically developed for the VW Polo 1.4L 16V and 1.6L 16V engines (engine