Pulstar dg1i Iridium Pulse Spark Plug, Pack of 1

**** The Pulstar dg1i Iridium Pulse Spark Plug has garnered mixed reviews from users regarding its performance and reliability. While some drivers, like the owner of a 2009 Hyundai Sonata, report undoubtedly positive experiences, noting a slight increase in performance along with a noticeable improvement in gas mileage (around 2-3 mpg), others find themselves disappointed. One user, opting for the iridium spark plugs for their Xterra, noted significant reductions in performance, expressing dissatisfaction with what they perceived as wasted money. A significant concern highlighted by customers is compatibility with various engine types. One driver mentioned successful installation in a Lexus IS 250, where the spark plugs worked flawlessly and the engine ran smoother—potentially just due to the replacement of older plugs. Conversely, another user experienced immediate problems with their vehicle’s performance, leading to an urgent desire to revert to traditional plugs. Issues of quality control also come into play, with reports of defective products out of the box. In one case, a customer encountered a plug with a cracked ceramic. However, the brand's customer service received praise, as they facilitated a hassle-free exchange. Overall, the Pulstar dg1i spark plug exemplifies a polarized reception: while some drivers extol its advantages, citing enhanced performance and efficiency, others strongly caution against their use in certain vehicles, favoring more established brands like NGK. **