ORIGINAL: Epsilon

Those don't work. It's not really a chip, but just a resistor that you put in parallel with the intake air temp sensor to 'fool' your ecu into thinking the intake air temp is colder than it really is to run a little richer/more gas. The o2 sensors output probably offsets a significantly richer mixture, making the 'mod' of limited merit, since they are not wideband.

Turbulence in the intake airflow produced by the filter or piping, or a change in intake diameter at the point where the airflow is measured can produce inaccurate airflow readings. The error in airflow then translates to an error in the amount of added fuel. In the worst case, the air/fuel ratio can run lean, causing detonation and possibly engine failure although the airflow sensor will generally detect and correct the throttle to compensate for the warmer air. This can also be solved by modifying/elongating the intake piping, replacing the airflow meter, or by replacing/remapping the engine control computer to provide the correct amount of fuel for the intake airflow at all engine speeds.