hot racing coil

#1
Anybody had or have any experience with a NGK hot racing coil that's being sold on ebay for a gx200 and clones? I seem to think maybe seller is being dishonest by just changing the wire and boot to a different color. Can't get the seller to answer any of my questions about the the performance of the coil that they are selling or any spec.s on the resistance or size of the racing coil.
Anybody bought one or have knowledge of this product or any way to make a stock coil produce a hotter spark?
 
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