Time-Limited Go Fast Bits Blow Off Valve Whistling Trumpet High Boost Attachment

Description

Upgrade your Subaru’s blow-off valve sound with the Go Fast Bits Blow Off Valve Whistling Trumpet High Boost Attachment. Designed to deliver a distinctive piercing whistle, this trumpet lets you stand out from the crowd with an aggressive, high-boost sound signature. Perfect for enthusiasts seeking a unique audio upgrade, it replaces the standard trumpet on GFB valves T9003 and T9503.

This attachment requires the valve to vent most or all air through the trumpet to produce the signature whistle. It’s not ideal for 50/50 venting valves like Respons models, which typically lack the velocity needed to whistle. The whistling trumpet was first introduced in 2004 and remains a popular choice for drivers wanting a sharp, attention-grabbing boost sound.

Ideal for Subaru WRX STI and other turbocharged models using GFB valves, this premium attachment enhances your forced induction setup with a distinctive tone. Shop now at Subimods and add a unique sound to your boost experience.