Re: 2006 wk spark plugs
My experience is the Champion OE do just fine. Save your money and stick with the same as what comes off the factory line. Had an 06 WK 4.7 and that's what I used. That's what I have in my 07 WK 4.7. Never had a problem.
2007 WK Rocky Mountain Edition Laredo
Red Rock Crystal Pearl Coat
4.7 flexfuel V8, QTII, SuperChip 3875, OME HD, OME strut/shocks f/r, Spidertrax 1.5" spacers f/r, '06 Limited chrome grill (currently swapped with "Murdered" expanded metal grill), rear hitch mod, 265/70/17 Nitto Terra Grappler spare, Smittybilt rear hitch shackle,
Ronin II wheels w/ GY Wrangler Authority 265/70/R17's
2011 KK Limited 3.7L V6
everything brand new stock