A complementary product is a rev limiting switch that can be set to different limits. It can be used as a rev limiter (good for FZR600s using FZR400 TCIs ), as a launch controller (push the launch button, pin the throttle WFO, and feather the clutch - the revs will NOT go past your set launch limit until you release the button), as a shift light driver, or whatever your devious mind can envision. Pricing: Rev Limiter Solo - $50 (stand alone unit) Rev Limiter Dual - $75 (stand alone unit) Rev Limiter Add-on - $25 (built into QS controller) Push Button - $25 (for use with Launch Controller)