Review on NGK 6441 ZFR6FIX 11 Iridium Spark by Travis Jarvis

My analysis of this ignition part showed that it is hands down the best on the market! The performance and consistency of these spark plugs are second to none. I have noticed a significant improvement in both the fuel economy of my car and the overall performance since installing them. The iridium material ensures longer durability, and the installation process was straightforward. The only con is that they are slightly expensive, but the performance benefits make up for the cost.