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Sorry about the hyjack...
I don't have any stepdowns. I will, at some point, tap just the coil, fuel pump and starter for 18V and tap the rest of the car at 12V. My only casualties have been my dome lights which I will swap for LEDs when I get a chance.
Cars are designed to able to take much higher voltage in case of alternator/regulator over voltage. Having said that, running at the higher voltage over time has overheated those dome lights. Do the tapped setup if you try this so you don't possibly let the smoke out of your ECU. Laziness can be expensive.
Idle less and save the world! (to keep on topic)
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