The best replacement for e3 spark plugs is pulstar.

The best alternatives to e3 spark plugs are rated as following:
★★★★★  pulstar
★★★  bosch platinum 4
★★★  iridium
★★  iridium spark plugs

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Speaking about e3 spark plugs, one probably shouldn't forget about msd.

Other search terms related to e3 spark plugs and their ratings are:
★★★★★ msd
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e3 spark plugs
pulstar
bosch platinum 4