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THEY PER SAY DO NOT GIVE YOU MORE SPEED BUT ALLOW YOUR ENGINE TO REV SOMEWHAT HIGHER WHEN MODIFICATIONS ARE PUT IN PLACE. A STOCK QUAD WILL NOT SEE ANY BENEFIT WITH A REV LIMITER.....IF YOU ADD FULL EXHAUST SYSTEM, RE-JET AND ADD AIRFILTER OR EVEN OPEN UP THE AIR BOX, YOU WILL HIT THE STOCK REV LIMITER.....WHEN THOSE MODS ARE DONE, A REV LIMITER WILL REALLY OPEN UP YOUR QUADS POWER...

 

yea i guess they will give you more speed. higher rpm with the same gearing and tires and you will go faster.