Dynojet Q118 Jet Kit for TRX450R 06-10 Fits 06-10 TRX450R Stage 2 Stage 2 kits are intended for motorcycles with a stock or mildly tuned engine using a well designed aftermarket pipe with a modified airbox and a stock replacement air filter Stage 2 kit are designed for applications where individual filters cannot be installed and for applications where airbox modification improves the engine's performance, in most cases power increases of approximately 8 percent can be achieved