[shoooo32]

My experience is strictly anecdotal - I've never opened a Bosch, Parts Klassik or Classic Retrofit CDI and have only a basic understanding of capacitors.

You guys clearly have more skin in the game than I do given you repair these units. No different than the OP, I just want reliability. "Just carry a spare" is not a great solution in my opinion. That means there's been a failure, and I'm likely now troubleshooting this issue in some remote area of the country.

Given the SMEs in the room, what would be your opinion on the "ultimate CDI" for an aircooled 911? Did the aftermarket get anything right or does a freshly rebuild Bosch unit leave nothing on the table as far as reliability upgrades are concerned?