Just for another viewpoint, my mechanic felt that proper ignition maintenance would prevent high-altitude miss. He did not like the pressurized mag mod, I can't remember why.
Anyway, I clean and gap my plugs every 100 hours, and I have not had problems. I fly at 18 to 20K very frequently.
Now I'll probably get it on the next flight, just for opening my mouth...
I still think Bob's right, and pressurized mags are the way to go.
Kevin
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