Best way to increase speed and acceleration

[m3nf]

HI there, i recently got into rc cars and purchased a new Associated RC10B4.1 Brushless RTR to get myself used to the cars side of things.

I am using a bulk standard car with a 2c 5000mAh lipo, but i like to try to increase the top end a little more, but i do not want a huge speed increase but i am more keen on getting the acceleration more a little quicker.

What do you advice to do this, change the motor or the cogs ?

Be grateful if you could add links to items so i can understand more what part does.

Any help would be you could give to a new member i would be grateful.