What is my choice between speed density and mass air flow?
The choice will be influenced by what type of system you desire to run and your budget. Speed density is less complicated wiring, cheaper and easier to install without the complicated and expensive mass air system. However, it does have its drawbacks, as it is not as forgiving when you decide to change cam or exhaust as it depends on the engine manifold vacuum signal to help determine fuel calibrations. But for a very mild or stock engine with no desires to modify, it is a superb system. Mass air although more complicated and expensive will allow for more moderate changes without upsetting the fuel curve, as it calculates the weight and speed of the air to determine fuel load and is more responsive.
