[rbryantaz]

One thing that will be interesting is the lifespan of the coils in a tuned setup. If coils have a shorter life then that also makes a difference. When I first looked into the B58 coils it was because I wanted to change the coils once and forget about it.

I saw reports of people changing coils every 30k-40k miles which not only adds cost at that point it is just one other thing to worry about. I wanted to eliminate the question of "Is it time to replace my coils again."

The B58 coils seem like they have more headroom and therefore should last longer. Perhaps only time will tell on if the B58 coils have a significantly longer life. Some vendors do offer a lifetime warranty on coils but that warranty normally does require a coil to fail rather than just "I want new coils after 20-40k miles of operation."

Information about how many miles are achieved at a given power level would be interesting but there are many variables involved such as spark plug gap, E85 level, etc that make it quite complicated....

Full disclosure I did develop kits for the B58 coils and sell them so my input on this topic is biased now. I don't want to make unsupported claims but mentioning the coil life aspect seems like a fair aspect of the discussion.

-Rich