Go Fast Bits
GFB Whistling Trumpet (only for Stealth FX and WRX Hybrid)
- Regular Price
- $40.95 USD
- Sale Price
- $40.95 USD
- Regular Price
- $44.90
Sold Out
- Unit Price
- per
CARB Restricted: This product cannot be shipped to California or other CARB-regulated states.
Details
The 5701 can be used in place of the standard trumpet on GFB valves (Part numbers T9003 & T9503), and will make a whistling sound. However, it is necessary to run the valve so that all (or most) of the air vents through the trumpet ? Respons valves will typically not generate the velocity required to whistle when set to 50/50 venting.
Trusted Performance Specialists Since 1996 • 60,000+ Builds Powered • Authorized Dealer of 250+ Brands
Explore & Support
Shop By Category
Join the Insider List
Exclusive deals, new product drops, and fitment guides — direct to your inbox.
affirm
0% financing on orders $500+
SP Engineering • 424 Turnbull Canyon Rd, City of Industry, CA 91745 • Est. 1996
© 2026 SP Engineering. All rights reserved.
