The Pulstar Pulse Plug for 6.2L, 8-cylinder 2004-2013 Chevy Silverado, Avalanche and Tahoe applications has an 18mm reach length, 14mm thread diameter and tapered seat. The plug looks like a spark plug on the outside, but a unique capacitor-based circuit inside captures energy normally wasted by spark plugs, allowing it to generate a spark with 20,000 times greater energy. In third-party tests at certified labs, and internally at Enerpulse, Pulstar demonstrated improvements in engine performance and increased fuel economy by an average of six percent when compared to conventional spark plugs, even in "plug-and-play" installations.