My own experiences in searching for low-resistance coils specified by my service manual say that they're no longer available. All replacement coils will be high resistance. Using a spark gap tester to compare the low-resistance and available replacements I could see that the replacements would reliably fire at only a fraction of the gap of the low-resistance. This means much more frequent re-gap intervals for an already short interval on copper plugs. For those that like maintenance work that's fine but for a daily rider who favors seat-time this wasn't exceptable for me; so made other changes to offset what might otherwise be a re-gap with every other oil change.