Review on Bosch Automotive (9654) OE Fine Wire Double Iridium Spark Plug - Single: Improved Performance and Exceptional Durability by Robert Mac

Fits easily in my '06 Grand Cherokee with Hemi (16 total plugs). Now he purrs like a kitten. Does not require high-pressure lubrication during installation, which is stated directly in the instructions; good thing you don't have to buy it. All the old spark plugs were Bosch Iridium and popped out easily. I decided to upgrade to the Double Iridium model to "help out" the old engine, which is approaching 140,000 miles. Handles well and idles smoother than it has in a long time. A little more expensive than the champions but they should last a lot longer which is important for an old car that I will most likely be repairing.