Dynojet Intake Performance Stage 1 Jet Kit For 2005-2007 Kawasaki Zzr 600 Motor Average horsepower increases of 15%-25%! Each DynoJet kit is precisely engineered to provide a simple and cost effective solution for all your riding needs Kit includes jets, needle, spring, shim and instructions Stage 1: stock engine/filters, stock/modified pipes; about a 5% power increase