Look at this PIC- Are these Mil eliminators?

[YK99GT]

Hmm, just curious but I have a Bassani catted X and after install, the exhaust reaks quite a bit more (which was expected) but it smells like unburnt fuel AND my fuel economy has dropped by about 8-12% so I thought the car was going into a run rich mode (although running leaner would make more sense). My friend also thought the same thing (about running rich) with his catted X in his '01 Cobra because he swore he got more power when the SES light came one (and he is not a BS'er). I also heard the upper O2 are the ones that controlled the A/F ratio and the lower ones were only for monitoring purposes??? My SES light comes on once in a while which is also when fuel economy drops the most so I thought I should pick up MIL eliminators. But now after reading this, I wonder if this will eliminate the SES light only and not fix the other stuff.