HKS 71008-AK001 SQV4 Blow Off Valve (Universal - Audible Exhaust Valve)

HKS 71008-AK001 SQV4 Blow Off Valve (Universal – Vented Blow‑Off Valve)

The HKS SQV4 (Super Sequential Blow Off Valve) is a high‑performance vent valve developed for turbocharged vehicles and is known for its distinctive sound. Its patented sequential discharge system provides quick response at both low and high boost levels, delivering both performance and a sporty driving experience with its unique sharp vent sound.

✅ Sequential discharge design for instant response across the entire RPM range

✅ Unique sharp vent sound with a “dual tone” character

✅ Durable aluminum body and zinc‑plated piston mechanism

✅ Universal fitment (mounting hardware sold separately)

✅ Prevents boost loss and turbo lag

Unlike OEM valves, the SQV4’s design provides full venting at not just high pressures but also low boost levels—a crucial feature for tuned and high‑flow setups. Its reverse‑acting piston design also eliminates boost leaks.

Compatible Applications

- All turbocharged gasoline engines (universal use)

- Especially: Subaru WRX‑STI, Mitsubishi Lancer EVO, Nissan GT‑R, Toyota Supra, VW/Audi TFSI engines

Installation

You may need HKS‑specific adapter kits, hoses or flanges for installation. The box includes only the main valve. Use the correct mounting hardware for your vehicle. Professional installation is recommended.

Note

Compatible only with turbocharged engine systems. Check your vehicle’s valve connection type and location before purchasing.