Ehhhh... I am staying out of this one, but... no I don't sell anything with regard to "Demon Coils" or similar just to clarify. And do I recommend them? Nope. I have seen no evidence that there is a voltage issue on the OEM dual towers that can be reasonably solved... it is a design issue altogether being a dual coil hot/cold plug scenario with inverse polarity across an entire bank, which causes the spark kernel to be more shrouded under the ground electrode and weaker on one side. No matter how powerful you make the coils, they will always be unbalanced by design, and you cannot increase current beyond the capability of the PCM to drive them, so its like pissing up a drainpipe. Is also not so much of a horsepower problem, but a balance issue and a misfire problem at the lowest loading which is even harder to ignite properly [hence the inherent Idle Misfire that plagues Gen-1/2/3 applications that use duals]. Our older VS-1500TT package used the OE coils without a problem, but they definitely still had light idle misfire like all of the engines do that use them. These issues can lead to tune chasing, converter issues, and odd engine sound at low loads.
We have CNP conversions that are far more powerful and evenly balanced between cylinders because they aren't dual-towers, they are individual coils per cylinder and the PCM modifications and programming to run them.
Moral of story:
1. Is there a problem with OE coils? Yes. Is there also a problem with ANY coil that functions in a similar manner? Within reasonable outliers, also yes.
2. If you want this problem solved, you don't use dual-towers. You open your wallet wider, call me, and do it properly. Otherwise, just save your money.