To be fair, Mark, the speedbrakes from Precision Flight are US $4,100,
plus 35 hours installation labor, not 15k. However, I have learned
enough in the last few days to agree in principle with your point.

BTW, this Bonanza is equipped with TKS Weeping Wing, but the previous
owner shows me an invoice that was higher than 15k for that mod.

Fair enough. I was just guessing as I have neither mod.

- Mark