There has been a lot of bragging about who makes the best, most accurate jets. Some claim brass jets are eroded by flowing gasoline and nitrous, thus making them inaccurate. While it is true that the flow of gasoline and nitrous will eventually wear away the brass surface, that process would take about 1 million years, not a concern for most of us. The Nitrous Express HP Jets are manufactured on CNC equipment, and are guaranteed to be within .0005 of specified jet size. In recent testing, using the same jet size, HP jets out flowed the competition by 35%! That's right 35% more flow through the same orifice. The HP jet was designed to be more than just a hole in a piece of brass, contoured inlet and multi-stepped outlet allow turbulence free flow with no restrictions.