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The coils are probably the SAME as the ones in "fancy" boxes.

A few years ago, pretty much all (possibly ALL) oil-filled coils were made either at a facility in Andover, Michigan, or down in Mexico. The Mexican coils were notorious for burning up ignition boxes. Now, the Andover ("Made in USA") coils are about impossible to find, and all are either "Hecho in Mexico" or China. All the "brands" basically paid these companies to paint the coils their own color and use their packaging - but they were all coming from the same places.

I'd be really surprised if it is ANY different with the E-core coils. The "red" company will have the Chinese shop put red dye in the nylon housing, the "yellow" some yellow dye, etc... But most likely the SAME chinese shop makng the red ones, the yellow ones, and the ones you can buy.
 
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