I have one not sure wat fin is in mine.
Found this on a site
Purple Fin Nozzle: Low frequeny whistle. Gold Fin Nozzle: High frequeny whistle. Note, the normal SSQV fin's pitch is in-between these two fins. Hose fitting Nozzle: A screw-on fitting, 1in diameter, for routing a custom hose from the BOV to the Turbo Inlet Pipe