I was just wondering what sparkplugs everyone uses.
I have seen the splitfire and the E3 and just wondered if anyone had used those and if they are any good.

NGK is the best plug for the Nissan engines by far, and many have reported poor performance with the "fancy" plugs from other makers. I recommend the V-power copper plugs for best performance, but being copper-tipped they don't last all that long. Next option are the single-tipped G-power platinum economy plugs, or you can step up to the twin-tip platinum, or even the iridium, but I don't think they're really worth the money.