Table 2 shows the legend description used in the various figures. Figure 8 showsNOx emission versus engine speed from 1500 rpm to 6000 rpm with and without catalytic converters.
The test was conducted at wide open throttle (WOT).
It is found that wire mesh catalytic converter produces lower level of NOx emission with an average of 57 ppm all over the engine speed range followed by OEM catalytic converter (average 255 ppm).