I find that the blue gearset (low speed) runs faster on my 2.6 than the teal gears do on my 2.2. Thats probably because my 2.2 is shoddy and runs really poorly, but the gears definately make a difference.

Unless you mean canadian, gears should cost about $5 for a set.

Also, I have the super top speed gearset, the 3.43:1 from a Bit Racer (aka Hot Wheel KIT Racer) and its incredibly fast, if I give my car a push to start it and it has like a million feet of perfectly flat ground ahead to accelerate. I will let everyone know if my soon-to-be dual battery setup can use these gears, but as far as I know, no Bit can use them running 1.2 volts.