GFB Spares- Whistling Trumpet

🔧 Product Description

The GFB Whistling Trumpet (Part #5702) is a performance blow-off valve accessory designed to replace the standard BOV trumpet and deliver a unique high-pitched whistle sound under boost.

Originally developed as an evolution of the 5701 Whistling Trumpet, the 5702 version is optimised for lower boost applications, making it easier to achieve audible whistle characteristics across a wider range of turbo setups.

This simple bolt-on accessory is designed for drivers who want to stand out with a distinctive turbo sound while maintaining full compatibility with GFB’s performance valve systems.

⚙️ Key Features

• Direct replacement blow-off valve trumpet
• Produces high-pitched whistle sound under boost
• Improved low-boost responsiveness vs original 5701
• CNC-machined alloy construction
• Easy screw-on installation
• Designed for durability under high heat and pressure
• Compatible with multiple GFB valve systems

🔊 Sound Profile

🎵 High-Pitched Whistle Effect
Unlike traditional “whoosh” blow-off sounds, the Whistling Trumpet produces a sharp, piercing turbo whistle when airflow conditions are met.

🚗 Boost & RPM Sensitivity
Sound intensity increases with boost load and engine RPM, delivering a progressively louder and more aggressive whistle under hard driving.

⚙️ Compatibility & Fitment Notes

• Suitable for most GFB blow-off valves
• Recommended for Respons and Deceptor Pro II systems
• Excludes compatibility with T9003 & T9503 models
• Not ideal for heavily recirculated setups (reduced whistle effect)

🛠️ Installation Notes

• Direct screw-on replacement for standard GFB trumpet
• No modifications required
• Quick installation using existing valve hardware
• Ensure correct venting configuration for best sound output

💡 Why Choose the 5702 Whistling Trumpet?

If you want:

• A unique alternative to standard blow-off sounds
• A sharper, more distinctive turbo whistle
• Easy bolt-on sound modification
• Compatibility with most GFB BOV systems

👉 The 5702 is the simplest way to dramatically change the character of your turbo sound.

🏆 Perfect For

• Enthusiasts wanting custom turbo sound setups
• Street builds aiming for standout audio presence
• GFB Respons / Deceptor Pro II users
• Show cars and performance-focused builds
• Drivers who want something different from the standard “whoosh”