SR20DET engines in the S13 Silvia and 180SX often struggle with inconsistent boost control and compressor surge once boost levels rise or supporting modifications are added. The HKS Super SQV4 Blowoff Valve Kit (71008-AN024) is a premium upgrade that utilizes a unique sequential valve structure and differential pressure control system to deliver stable, precise operation across low to high boost ranges. Its Pull-Type relief design ensures reliable pressure release, protecting the turbo while sharpening throttle response and improving overall drivability.
Crafted with a silver-coated aluminum die-cast body and a metal secondary valve, the SQV4 offers both durability and a premium appearance under the hood. The distinctive Triple Fins in the funnel produce a sharp, aggressive blow-off sound that enthusiasts love, while an optional Round Fin (sold separately) allows fine-tuning of the tone to match your preference. This kit mounts cleanly in the factory location and is engineered for direct bolt-on installation, making it an ideal choice for both street and track builds.
At Terra Firma Automotive, we supply this genuine HKS Super SQV4 Blowoff Valve Kit as a top-tier upgrade for S13 Silvia and 180SX owners seeking better boost management and engaging sound. It eliminates harmful compressor surge, enhances throttle sharpness, and adds a stylish, functional element to your engine bay. For enthusiasts who want a reliable, adjustable blow-off valve that combines performance with personality, the HKS Super SQV4 is one of the most advanced and satisfying upgrades available for the SR20DET platform.
- HKS Super SQV4 Blowoff Valve Kit for S13 Silvia/180SX SR20DET
- Sequential valve structure with differential pressure control
- Pull-Type relief design for stable operation from low to high boost
- Silver-coated aluminum die-cast body with metal secondary valve
- Triple Fins funnel produces sharp, distinctive HKS blow-off sound
- Optional Round Fin available for custom sound tuning
- Eliminates compressor surge and improves throttle response
- Direct bolt-on fitment with clean factory-like installation
- Durable construction built for sustained high-boost applications
- Enhances turbo system protection and overall drivability
- Premium HKS engineering with proven real-world results
- Adds aggressive sound and premium appearance to the engine bay
- Ideal for both street and track SR20DET builds
- Trusted by Silvia enthusiasts for reliability and performance
- ⚠️ 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.