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There are hotter coils that are available, but they have to be matched to your triggering system. And I'm not speaking of voltage. I'm talking spark energy.
Dave knows his stuff and the finished product is an absolute work of art.
Dave and I have had several unpleasant technical exchanges on another forum, and we are the farthest from friends, but on the issue of his distributors he sells we are in agreement. We independently came to the same technical conclusion years ago on what would make a reliable and cost effective ignition system. What I have in my car is very similar to what he sells.
My understanding is that Dave has had some health challenges the past year, and that has affected his business activities. Nevertheless, I believe he still answers any correspondences regarding his products. I believe it's worth members' time to contact him if interested.