- Stage 1: stock engine/filters, stock/modified pipes; about a 5% power increase
- Stage 2: stock/mild modified engine, stock/modified pipes, stock/modified filters; about an 8% power increase
- Stage 3: stock/mild modified engine, stock/modified pipes, individual air filters; driveability may be compromised, N/A for some motors; about a 10-15% power increase
- Stage 7: race-only, high rpm, not for street use
- Increases power and drivability
- Fully adjustable
Yamaha -- YFM 660 F Grizzly 4x4 -- (2002, 2003, 2004); Yamaha -- YFM 660 FA Grizzly 4x4 -- (2008, 2006, 2007, 2005)
