Update your obsolete spray-bar type nitrous system with the Perimeter Plate Conversion Kit. This cost effective and easy-to-install upgrade immediately delivers all the benefits of the ZEX Perimeter Plate Nitrous System without having to purchase an entirely new nitrous kit. Perimeter injection results in more even distribution of fuel and nitrous for maximum power and engine safety. The conversion kit includes the square flange perimeter plate, gaskets and jet conversion chart.