Your buddy is an idiot. Sorry if he's a good friend but E3 is the same league as Splitfires and the Tornado fuel saver and anyone recommending them likely knows just enough about cars to be dangerous.
Autolite 103s, period, end of story. Coppers will perform the best, double platinums will last the longest. Coppers will last around 30k I'd say and they only take 30 minutes to do the plugs anyway. I did a huge thread recently on changing 2V spark plugs, all info is in there.
is the how to thread.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.