67 dart stroker hellcat gen3 hemi with twin turbos...

Here's a trick you can try. I found a ferrite ring located near the coil reduces RFI dramatically. For 8 mm wires I use Digi-Key PN 1934-1348-ND. Picture shows custom solid core wire on my son's go-kart. (I designed a custom ignition timing controller for small engines.)

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