Well, if your existing temperatures are balanced and fine then there is no need to improve airflow. I recommend first getting data on the temperatures of different components of your computer first and posting them on the website for us to see.
My recommended software to you is CPUID Hardware Monitor. Its free, light, and very good at getting temperatures from the computer. Post temperatures of your CPU, GPU, HDD, and MOBO if possible. Then if temperatures are to high, we'll further discuss what to do to improve airflow. You should also tell me your existing computer case and very detailed hardware specifications of your computer. That way we'll know which temperature ranges are the best for your specific hardware.