HKS Super SQV4 Blowoff Valve Kit For Nissan Skyline R33 R34 GTR 71008-AN025

High-boost RB26DETT engines in the R33 and R34 GT-R demand a blow-off valve that can handle everything from mild street tuning to extreme track setups without compromising reliability or response. The HKS Super SQV4 Blowoff Valve Kit (71008-AN025) stands out as one of the most advanced solutions available, engineered with a sophisticated sequential valve system and differential pressure control that maintains precise operation across a vast boost range. Its innovative pull-type relief mechanism prevents compressor surge while delivering the crisp, unmistakable HKS blow-off sound that enthusiasts instantly recognize and appreciate.

Constructed with a silver-coated aluminum die-cast body and a robust metal secondary valve, this valve offers exceptional durability and a premium, factory-like fitment that integrates seamlessly into the engine bay of both the BCNR33 and BNR34 Skyline GT-R. The thoughtfully designed triple-fin funnel not only enhances airflow dynamics but also produces a sharp, aggressive auditory signature that enhances the driving experience every time you shift. For those who prefer to customize the tone, an optional Round Fin is available separately, allowing precise sound tuning to match personal preference.

At Terra Firma Automotive, we supply this genuine HKS Super SQV4 kit as the trusted choice for discerning RB26 builders who refuse to compromise on quality or performance. Every component reflects HKS’s uncompromising Japanese engineering standards, resulting in improved throttle sharpness, faster boost recovery, and greater long-term reliability under sustained high-boost conditions. Whether you’re pushing your R33 or R34 on the street, circuit, or drag strip, this direct bolt-on upgrade elevates both the mechanical precision and emotional connection to your Skyline.

 

• Super SQV4 sequential valve design with differential pressure control
• Pull-type relief mechanism for stable performance from low to high boost
• Silver-coated aluminum die-cast body with metal secondary valve
• Triple-fin funnel delivers the signature sharp HKS blow-off sound
• Eliminates compressor surge while enhancing throttle response
• Direct bolt-on installation for R33 (BCNR33) and R34 (BNR34) GT-R
• Durable construction engineered for sustained high-boost applications
• Optional Round Fin available for personalized sound tuning
• Premium under-hood appearance that complements RB26 engine bays
• Maintains excellent boost control and reliability under aggressive driving
• Pull-type design ensures consistent operation regardless of boost level
• Trusted HKS engineering with proven real-world track and street results
• Improves overall turbo system efficiency and shift feel
• Genuine HKS product backed by decades of Skyline tuning expertise
• Ideal upgrade for both stock and heavily modified RB26DETT builds
• ⚠️ Emissions / California Legal Disclaimer – Off-Road / Competition Use Only: This product is intended for off-road, competition, and track use only. It is not legal for sale or use on public roads or highways in California (or any other CARB-adopting state). For more information Click Here.