GFB Mach 2 Recirculating Plumb Back Blow Off Valve
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GFB Mach 2 Recirculating Plumb Back Blow Off Valve - Hyundai i20N (BC3) / i30 N-Line (PD) / Kona N-Line (OS) / Sonata N-Line (DN8)
GFB built the Mach 2 around its proven TMS technology, giving you dependable boost holding and sharper throttle response without the fuss of adjustable venting bias. It's a straightforward, bolt-on upgrade for the Hyundai i20N, i30 N-Line, Kona N-Line and Sonata N-Line, replacing the factory bypass valve with no extra adaptors or vehicle mods required.
This listing covers the Hyundai i20N (BC3), i30 N-Line (PD) and Kona N-Line (OS) fitted with the Smartstream 1.6T-GDI engine (G4FP), plus the Sonata N-Line (DN8) with the 2.5 T-GDI engine. SKU T9114 is supplied as a 100% recirculating (plumb back) valve for quiet, performance oriented operation.
Important: This valve is not compatible with i20N, i30 N-Line or Kona N-Line models running the Gamma 1.6T-GDI (G4FJ) engine — confirm your engine code before ordering.
Key Features
- Direct bolt-on replacement for the factory diverter valve
- TMS technology for up to 30% quicker return to peak boost on gear shifts
- Effectively unlimited boost holding capacity
- 100% recirculating configuration for factory-like quiet operation
- Optional atmosphere venting conversion available separately
Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please ensure your vehicle's engine code and trim level are confirmed before ordering.
Not sure if this valve suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.
Vehicle Compatibility
| Make | Model | Chassis | Engine |
|---|---|---|---|
| Hyundai | i20 N | BC3 | G4FP |
| Hyundai | i30 N-Line | PD | G4FP |
| Hyundai | Kona N-Line | OS | G4FP |
| Hyundai | Sonata N-Line | DN8 | - |
Technical Specifications
| Spec | Value |
|---|---|
| Valve Configuration | 100% Recirculating (Plumb Back / Bypass) |
| Core Technology | GFB TMS Technology |
| Compatible Engine (i20N / i30 N-Line / Kona N-Line) | Smartstream 1.6T-GDI (G4FP) — not compatible with Gamma 1.6T-GDI (G4FJ) |
| Compatible Engine (Sonata N-Line) | 2.5 T-GDI |
| Atmosphere Venting Conversion | Available via hose plug or separately sold Atmosphere Conversion Kit |
| Optional Outlet Accessories | Standard Trumpet (6110), Whistling Trumpet (5702) |
No instructions available for this product.

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