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To continue on the hijack, let me suggest yet one more twin plug option that seems to have been dismissed earlier in the thread: a 964 twin distributor. I believe they can be retrofitted and made to work, both in 911s and 930s (if you're willing to modify the turbo up-pipe). I have a picture of one that's in a 930, so I'm assuming they can be made to work anywhere. Please correct me if I'm wroing. The advantage would be cost; one can often be bought for a few hundred dollars (plus modification costs), and the replacement caps and rotors are readily available and not too expensive. Another general benefit to a distributor (or pair of distributors), is that you get sequential ignition (not wasted spark, as with most crank-fire setups) and you have the advantage of being able to run with only two coils and a two channel CD ignition, if you want to run CD. I don't think that a multi-coil wasted spark system is necessarily a bad thing, but if you try to run CD with a multi-coil system, you need lots of CD channels, which can be problematic and expensive.
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