The GFB 5702 Whistling Trumpet is a direct replacement for the standard trumpet on all GFB valves, designed to generate a distinct, high-pitched whistling sound during atmospheric venting. Compared to the 5701 model, the 5702 activates more readily and at lower boost or RPM thresholds, providing a more consistent sound profile.

• Manufacturer Part Number: 5702
• Compatibility: Replaces standard trumpets on all GFB valves
• Acoustics: High-pitched whistling sound
• Optimized Airflow: Engineered for high-velocity venting

To achieve the signature whistle, the valve must be configured so that the majority of air vents through the trumpet. Please note that GFB Respons valves may not generate sufficient air velocity to trigger the whistle when set to a 50/50 venting bias; full or high-percentage atmospheric venting is recommended for best performance.

The GFB 5701 Whistling Trumpet is a specialized accessory designed to replace the standard trumpet on select GFB blow-off valves. This component is engineered to produce a signature whistling sound during atmospheric venting by utilizing high-velocity air discharge.

For the best acoustic results, the valve must be configured so that all or most of the air vents through the trumpet. Please note that GFB Respons valves typically do not generate the air velocity required to trigger the whistle when set to a 50/50 venting bias.

• Direct replacement for trumpets on GFB part numbers T9003 and T9503
• Compatible with GFB Stealth FX and WRX Hybrid valve series
• Designed for maximum air velocity to ensure consistent sound
• Manufacturer Part Number: 5701

The GFB 33mm Hose Plug (MPN 5533) is a precision-engineered solution for securely blocking off automotive hoses with a 33mm internal diameter. This component is essential for enthusiasts modifying their forced induction systems, particularly when deleting a recirculation hose or converting a bypass valve setup to atmospheric discharge.

• Precision Fit: Sized specifically for 33mm ID hoses to ensure a leak-free seal.
• Machined Profile: Features a ribbed outer diameter to provide maximum grip and retention when secured with a standard hose clamp.
• Specialty Application: Commonly used for plugging intake return ports after installing an atmospheric blow-off valve (BOV).
• Authentic Quality: Genuine GFB (Go Fast Bits) component ensures high tolerances and reliable performance under pressure.
• Manufacturer Part Number: 5533

Fits select 2002-2017 Subaru Impreza WRX/STI, WRX STI, Forester XT, Legacy GT, Outback XT, Baja, and 2006 Saab 9-2X Aero (EJ20 / EJ25).

The BLOX Racing Intercooler Blow Off Valve Gasket is a direct-fit replacement designed to maintain a pressure-tight seal between the blow-off valve (BOV) or bypass valve (BPV) and the top-mount intercooler (TMIC). Over time, factory gaskets can become brittle or crushed, leading to boost leaks that cause loss of power, erratic idling, and poor throttle response. This precision-cut gasket ensures your forced induction system operates at peak efficiency.

• Direct replacement for the factory BPV/BOV gasket
• Prevents boost leaks at the intercooler mounting flange
• Engineered for EJ20 and EJ25 turbocharged engines
• Essential for routine maintenance or when upgrading intercooler components
• Manufacturer Part Number: BXFL-50016

Detailed Fitment Applications:

• 2006 Saab 9-2X Aero
• 2004-2006 Subaru Baja Turbo
• 2004-2013 Subaru Forester XT (Sports 2.5 XT, Limited, Premium, Touring)
• 2002-2014 Subaru Impreza WRX (Limited, Premium, TR)
• 2004-2014 Subaru Impreza WRX STI (Limited, Special Edition)
• 2005-2012 Subaru Legacy GT / 2.5GT (Limited, spec.B)
• 2005-2009 Subaru Outback XT (Limited)
• 2015-2017 Subaru WRX STI (Base, Launch Edition, Limited, Series.HyperBlue)

Fits 2007-2013 Mini Cooper S, John Cooper Works, Clubman, Coupe, Roadster, and GP models.

The ALTA Performance BPV Spring Upgrade (AMP-TAC-100) is a precision-engineered solution designed to fix boost leak issues and improve the responsiveness of your turbocharger system. The factory bypass valve (BPV) spring is often calibrated with a low tension that can lead to premature venting or slow closing, especially on modified vehicles. This heavy-duty upgrade ensures the valve remains sealed under high-load conditions and snaps shut faster after shifts, recovering boost pressure more efficiently.

• Eliminates premature boost venting and associated power loss
• Provides sharper throttle response and improved boost recovery between gears
• Specifically calibrated to replace the internal OEM bypass valve spring
• Constructed from high-tensile spring steel for consistent performance and longevity
• Simple installation within the factory BPV housing
• Manufacturer Part Number: AMP-TAC-100

Vehicle Fitment