Have never used a E3 plug but did try out the split fire plugs of the day............changed my ET "0" but had a better idle. (theses were in my first porting job Bigger is Better!!!)
When they came out, they claimed, HP increase.............and they faded away................
These plug have to be good plugs.............i mean after all, good old "John Force" is using and promoting them......right?
