There was an episode of Horsepower TV where they did some fairly extensive tests on the E3's with regards to economy and emissions.
I think if they have any real advantage over a std plug...... that's probably where it is.
What I liked about the NGK T plug was the way the ground straps are oriented it wouldn't trap the spark/kernel under the ground strap.
I run the 2 strap one
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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