I had a few drinks at the AOTH auction and bought the rights to any turbo propeller then I realized I have 3 Turbo props for my 16 already (Turbo 1 in a 23p, 21p, and TXP 21p) for different conditions so I don't need a fourth! $275 gets you any Turbo brand propeller you need, I'll mail you the paperwork. Send me a PM.