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There are molded-in conductors that cris-cross each other in that cap. Depending on how 'hot' you make the ignition, those caps can have electrical "cross-talk" between conductors and cause misfires. With a stock ignition system, I don't think there is any real problem with them. Just a lot of money for 'no gain', IMO. [I consider that kind of product a "GO FASTER" item...like those $200 air cleaners. ]
There are molded-in conductors that cris-cross each other in that cap. Depending on how 'hot' you make the ignition, those caps can have electrical "cross-talk" between conductors and cause misfires. With a stock ignition system, I don't think there is any real problem with them. Just a lot of money for 'no gain', IMO. [I consider that kind of product a "GO FASTER" item...like those $200 air cleaners. ]
The first part of your post was exactly what I was thinking...
It creates the problem it was designed to eliminate.
I have read the warnings that painting the distributor cap can cause arcing. I contacted Krylon and asked about the metal content of their their Fusion paint for plastics. Here's the response.
"Thank you for taking the time to contact Krylon. We appreciate your interest in our products. The paint does not contain metal. You can contact our Regulatory Department for formula related questions: 1-216-566-2902"
Just FYI.
(I have no interest in Krylon except as a potential customer.)