I am running the NGK ZFR 6F11's, they are a bit longer than the stock plugs. BY this I mean that they protrude abit more into the combustion area. I have heard some express concernabout the electrode contacting the piston, but I have gone through 3 sets of them with no trouble. I do wring it out from time to time, so you can wind it to the redline. Run stock gap, they come out the perfect color gray when they are used. Fuel economy improved about 1-2 mpg on highway, and it does seem like it pulled a bit harder with Cu over Pt.

BTW, they are the same plugs my buddies non vtec prelude used, it was a 94 or so.