HKS 14005-AK002 GT II External Wastegate Billet Aluminum 50mm

The HKS GT II Wastegate represents the latest advancement in HKS wastegate technology, engineered for high-performance forced induction applications. The lower body is cast from stainless steel, while the upper case is precision-machined from billet aluminum with an anodized purple finish — delivering a construction that is both lightweight and exceptionally durable.

Compared to the original HKS GT Wastegate, the GT II is approximately 1/3 lighter and significantly reduced in both height and width. Its compact footprint, combined with V-band inlet and outlet flanges, provides versatile, flexible mounting options even in tight engine bay environments.

Key Features:

• Stainless steel lower body with billet aluminum anodized purple upper case
• Approximately 2/3 the weight of the original HKS GT Wastegate
• V-band inlet and outlet flanges for versatile mounting
• Available with a 50mm or 60mm stainless steel valve
• Includes additional wastegate springs for adjustable base boost level starting points
• Special spring installation tool included
• Compatible with HKS EVC and VBC boost controllers for boost levels above base setting

Boost Specifications:

• 50mm valve: Base boost range 0.8 kg/cm² (11.6 PSI) to 2.0 kg/cm² (29.0 PSI)
• 60mm valve: Base boost range 0.6 kg/cm² (8.5 PSI) to 2.1 kg/cm² (29.9 PSI)

The HKS GT II Wastegate is the ideal choice for performance enthusiasts and professional tuners seeking precise boost control in a compact, high-quality package. Boost levels can be raised above the base setting using an HKS EVC or VBC boost controller.