GFB Whistling Trumpet (suits all valves) - 5702 Thermostat Housing A packet of grease is

A packet of grease is included with each kit to help lubricate certain areas during installation

but in a common 52mm size for easy mounting

Gen 3 Bar is our strongest design ever

With its lightweight triple core

elegant and robust solution that can be relied on for simple boost control & maximum response

GFB Whistling Trumpet (suits all valves) - 5702 Thermostat Housing A packet of grease isThe 5702 can be used in place of the standard trumpet on all GFB valves, and will make the whistling sound more readily than the 5701 (high boost and RPM is required to get the whistle from a 5701), and at a slightly higher pitch.? Like the 5701 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. The