"Not the cheapest but definitely affordable. I was having rpm spikes during idle and shifting. No longer have rpm spikes and fuel economy improved by 20 percent. Mind you the previous plugs were"... (read full reviews)
"Went through a few other kinds of plugs for my Jeep, always ended up with problems. A tad expensive for "basic" copper plugs but these guys run the best. Strongly recommend for any Jeep owner with the"... (read full reviews)
"Bought these for my 6.0l Chev vortec. After 3 weeks one of the plugs failed. Had to get diagnostic done. Cost me $150 for the test and $65 for the plugs. Took them out and replaced with AC Delco which"... (read full reviews)