SKU: 71002-AK011 | UPC: 4957266262184
HKS 50mm Weld-on Steel BOV Flange – Universal for Custom Turbo Piping
This HKS weld-on flange provides a secure mounting base for 50mm HKS blow-off valves like SSQV and SQV series. Designed for custom intercooler or charge piping on performance vehicles including Subaru WRX/STI, Mitsubishi Lancer Evolution, and Nissan models. It enables smooth boost pressure release to protect turbochargers from surge and maintain peak performance during shifts.
Key Features
- 50mm Bore Size: Matches standard turbo outlet piping for seamless integration and unrestricted airflow.
- Steel Construction: Heavy-duty mild steel withstands high heat and pressure in forced induction setups.
- Precision Bolt Pattern: Exact 70mm x 70mm spacing with four M8 holes aligns perfectly with HKS BOV bodies.
- Weld-On Design: Flat flange base simplifies attachment to aluminum or steel pipes using TIG or MIG welding.
- Raw Finish: Prepped surface promotes strong welds without contaminants for long-term durability.
Product Notes
- Verify pipe wall thickness before welding. best on 2-3mm material.
- Clean flange and pipe thoroughly for optimal weld penetration.
- Packaged in anti-corrosion bag with protective foam insert.
Installation Notes
- Professional installation recommended.
- Weld in horizontal position for even heat distribution and to avoid distortion.
- Includes gasket surface. use HKS BOV gasket (sold separately) for seal.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX STI |
| 2008-2021 | Subaru | Impreza | WRX STI |
| 2004-2012 | Subaru | Forester | XT |
| 2003-2015 | Mitsubishi | Lancer | Evolution VIII-IX-X |
| 2008-2015 | Mitsubishi | Lancer | Evolution MR GSR Ralliart |
| 2009-2023 | Nissan | GT-R | Premium |
| Universal | All | Custom Turbo | 50mm Piping |
Why Choose HKS?
- Proven in JDM racing and street applications worldwide.
- Manufactured with tight tolerances for consistent performance.
- Backed by decades of turbocharger engineering expertise.
Frequently Asked Questions
- Q: Which HKS blow-off valves fit this flange?
A: Compatible with all 50mm HKS models including SSQV4, SQV4, and Super SQV. Bolt pattern ensures direct bolt-on after welding. - Q: What material is the flange made from?
A: High-strength mild steel ideal for welding. resists cracking under boost pressures up to 30 PSI. - Q: Does installation require special tools?
A: Standard TIG/MIG welder and clamps suffice. Align flange perpendicular to pipe flow direction for best results.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Compact box 4 x 4 x 2 inches
- Weight: 0.44 lbs
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