Review on Bosch Automotive OE 9600 Fine Wire Double Iridium Spark Plug - Single by Jorge Toussaint

These spark plugs perform much better than I expected when I fitted them to my car. I haven't installed new spark plugs in several years and immediately noticed a significant improvement in engine performance. Also, it seems to run much quieter and I experience much better fuel economy. The car didn't work that well even when it was brand new. I could buy a much cheaper spark plug but in this situation buy the best one and you will never be disappointed. They were very valuable when I bought them from Revain.