Go Fast Bits T9404 VTA Blow-Off Valve Ford EcoBoost Mustang Bronco Ranger Raptor

Vehicle Fitment

• 2015-2023 Ford Mustang S550 (EcoBoost, 2.3L I4 Turbo)
• 2019-2023 Ford Mustang S550 (EcoBoost, 2.3L I4 Turbo - Fomoco diverter valve equipped)
• 2019-on Ford Focus ST Mk4 (2.3L EcoBoost I4 Turbo)
• 2019-on Ford Focus Mk4 (1.5L EcoBoost I4 Turbo, 4-cylinder)
• 2019-on Ford Fiesta ST (1.5L EcoBoost I4 Turbo)
• 2021-on Ford Bronco (2.3L EcoBoost I4 Turbo)
• 2021-on Ford Bronco (2.7L EcoBoost V6 Turbo)
• 2023-on Ford Bronco Raptor (3.0L EcoBoost V6 Turbo)
• 2022-on Ford Ranger Raptor (3.0L EcoBoost V6 Turbo)

Fitment Notes

• Fits Ford EcoBoost vehicles equipped with the Fomoco-brand electronic factory diverter valve only - does not fit earlier Pierburg-valve Ford models such as the 2012-2018 Focus ST Mk3 (use T9454 for those applications)
• Does not fit Ford Focus ST Mk3 2.0L EcoBoost (2012-2018) - those applications use the GFB T9454
• Does not fit Ford Mustang S550 EcoBoost 2015-2018 with Pierburg diverter valve - confirm factory diverter valve brand before ordering
• For a standard "whoosh" blow-off sound without the trumpet whistle, GFB offers the T9484 for the same vehicle applications
• For a silent recirculating upgrade (no blow-off sound), use the GFB T9384 DV+ for the same applications
• Not for use on vehicles with aftermarket turbos unless the original factory Fomoco diverter valve mounting location is retained - contact GFB to confirm fitment
• Not legal for sale or use on emissions-controlled vehicles in California (not CARB-compliant)

Features

• VTA (Vent-to-Atmosphere) design delivers an aggressive blow-off sound - includes a removable extended trumpet that produces a loud, high-pitched whistle; remove it for a more traditional "whoosh"
• Adjustable spring preload allows fine-tuning of when and how long the valve vents - softer preload for earlier venting at lower loads, firmer for high-load-only venting
• Integrated low-profile solenoid in an "over-under" stacked configuration allows direct bolt-on installation in the factory diverter valve location with no clearance issues
• GFB's patented pilot-actuated piston design opens and closes progressively based on ECU demand - unlike the binary open/close operation of the factory valve - for smoother throttle transitions and reduced compressor surge
• Replaces the factory moulded plastic valve internals with precision CNC-machined metal components and a durable elastomer piston seal for reliable boost holding up to 50 psi
• Retains full factory ECU and solenoid control - no MAP sensor issues, no boost control problems, and no tune required
• Faster boost recovery between gear changes by preserving charge in the intercooler during valve actuation
• Eliminates compressor surge associated with the factory diverter valve at high boost levels
• Manufactured in Australia under ISO 9001 quality management standards
• Backed by GFB's lifetime warranty

Specifications

• Part Number: T9404
• Product Line: VTA (Vent-to-Atmosphere) Performance Blow-Off Valve
• Solenoid Design: Integrated low-profile, over-under stacked configuration
• Valve Operation: Pilot-actuated piston (progressive open/close)
• Piston Seal Material: Elastomer (Viton face seal)
• Valve Body Construction: CNC-machined billet aluminium and brass
• Max Boost Pressure: Up to 50 psi
• Sound Configuration: Removable extended trumpet (whistle) or standard vent (whoosh)
• Spring Preload: Adjustable
• Compatible Factory Diverter Valve: Fomoco-brand electronic diverter valve (late-model Ford EcoBoost)
• Country of Manufacture: Australia (ISO 9001 certified)
• Warranty: Lifetime

Included Components

• 1x T9404 VTA Blow-Off Valve body with integrated solenoid
• 1x Removable extended trumpet (for whistle sound)
• 1x Piston assembly with elastomer seal
• All mounting hardware required for direct bolt-on installation

Product Description

The Go Fast Bits T9404 VTA is a direct bolt-on blow-off valve designed for Ford EcoBoost vehicles equipped with the factory Fomoco electronic diverter valve, including the Mustang EcoBoost, Ford Bronco, Bronco Raptor, Ranger Raptor, Focus ST Mk4, and Fiesta ST. Where most blow-off "spacer" solutions simply redirect vented air without addressing the factory valve's core reliability and performance deficiencies, the T9404 replaces the factory diverter valve entirely. The moulded plastic OEM valve components are swapped out for precision CNC-machined billet aluminium and brass components sealed with a durable elastomer piston, solving the boost leakage and long-term reliability problems inherent to the factory unit while simultaneously unlocking the iconic blow-off sound EcoBoost owners want.

What sets the T9404 apart from the T9484 (GFB's standard VTA for the same applications) is the included removable extended trumpet. With the trumpet installed, the T9404 produces a loud, high-pitched whistle that is unmistakable and unique - a sound very different from a conventional whoosh. Remove the trumpet and the valve vents with an aggressive but more traditional blow-off tone. Either way, adjustable spring preload lets the owner dial in exactly when the valve opens and for how long, giving full control over sound character and throttle response behaviour at different driving loads. GFB's patented pilot-actuated piston design ensures the valve opens and closes progressively in response to boost pressure rather than snapping binary open-or-shut, which smooths power delivery, reduces turbocharger surge, and speeds boost recovery between shifts.

Installation requires no permanent modifications and no tune. The T9404's integrated low-profile solenoid sits in an over-under stacked configuration that fits cleanly in the factory diverter valve location - even in engine bays with aftermarket intake pipes fitted. The factory ECU and solenoid are retained for full OEM control, ensuring the fastest possible valve response and complete compatibility with stock and modified tune files. Every T9404 is manufactured in Australia under ISO 9001 quality standards and is covered by GFB's lifetime warranty, making it one of the most technically thorough and durable blow-off valve solutions available for modern Ford EcoBoost performance applications.