I have to replace my sparkplugs ,I am currently using autolite plugs but came across these E3 ones and they sound allright . Has anyone heard of them and if not what plugs does every body run in there bikes

In my professional opinion, unless your engine is highly modified, I would run the stock plug that came with the bike. All these aftermarket  plugs fall into the category of snake oil. I've been twisting wrenches for 45+ years and have found that the ones that came in it are the plugs to use and they are cheaper.  Oh, and the myth that you need to change them every ten k is just a way for Harley to get more money out of you. 40-50 k is fine on a decent running bike.----jack

Mine had a set of autolites in it when i got it new in 95 and i have only changed them once before , I was sent a set to my shop to try to see what i thought of them and since i was looking at changing mine i thought i would see if anyone on here had heard of them or used them .