RB25DET-powered R33 GTS25T and R34 GT/GTT owners know that the factory blow-off valve quickly becomes a weak point once boost levels rise. The HKS Super SQV4 Blowoff Valve Kit (71008-AN020V) addresses this with precision Japanese engineering, featuring an advanced sequential valve structure and differential pressure control system that ensures consistent, surge-free performance from low boost to high-boost applications. Its pull-type relief design delivers stable operation regardless of pressure, resulting in noticeably sharper throttle response and faster boost recovery between shifts.
This complete Super SQV4 + Return Kit is specifically developed for the ECR33 and ER34 chassis, offering a direct upgrade path that enhances both reliability and driving enjoyment. The valve body combines a silver-coated aluminum die-cast construction with a robust die-cast metal secondary valve, creating an ideal balance of lightweight strength and premium appearance that elevates any RB25 engine bay. The distinctive triple-fin funnel generates the aggressive, unmistakable HKS blow-off sound that turns heads, while an optional Round Fin allows owners to fine-tune the tone to their exact preference.
At Terra Firma Automotive, we supply this genuine HKS Super SQV4 Blowoff Valve Kit as the trusted choice for enthusiasts who want proven performance and refined sound from their R33 or R34 Skyline. The kit includes the necessary return pipe components, though minor modification of the factory return pipe is required for perfect integration. This upgrade not only protects your turbo system under increased boost but also adds a layer of sophistication and auditory drama that makes every drive more engaging. For RB25DET owners seeking a reliable, great-sounding blow-off solution that performs on both street and track, the HKS Super SQV4 stands in a class of its own.
- Super SQV4 sequential valve design with differential pressure control
- Pull-type relief mechanism for stable boost operation across all ranges
- Silver-coated aluminum die-cast body with die-cast metal secondary valve
- Triple-fin funnel produces the signature sharp HKS blow-off sound
- Optional Round Fin available for custom sound tuning
- Includes return kit components for R33 GTS25T and R34 GT/GTT
- Direct upgrade for ECR33 and ER34 RB25DET models
- Eliminates compressor surge while improving throttle response
- Requires minor factory return pipe modification for installation
- Premium under-hood appearance that complements modified RB25 builds
- Durable construction built for sustained high-boost reliability
- Enhanced boost recovery and shift feel for better drivability
- Genuine HKS engineering trusted by Skyline enthusiasts worldwide
- Ideal for both street-driven and track-focused RB25DET setups
- Combines performance, reliability, and iconic HKS sound quality
- ⚠️ 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.
Questions & Answers
Have a Product Question?
Be the first to ask a question about this part.