Well said, 85SE!
Phil is right. In my case, I've been working on these things since the mid 80s. I've had every combination of 12As and 13Bs, except a peripheral port. I've wanted to go 20B for a while now, and Phil can even vouch for me on that. I began talking with him over 2 years ago about a 3 rotor setup and I still haven't pulled the trigger on the project yet. A 3 rotor setup is a huge undertaking, especially if you don't understand how everything works with each other (and part of that is tuning).
As Phil also mentioned, you may want to go a different route. You stated that for about the same $$$ as those ebay auctions I showed you, you would spend in turbo'ing a 12A or 13B. There's many different ways to go about turbo'ing a 2 rotor without having to spend $5k. Yes, you will spend a couple of grand, but not all of $5k.
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