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Hmmmm. whoever told ya that is on cheap drugs doood...
Lama measure Oxygen and calculates air/fuel ratio where Lama 1 = (Stoichiometric) ratio of about 14 to 1.
temps have aboslutely nothing to do with it.. modern Oxy sensors are supplied with a constant heat suply to enable it to work properly..
in your application teh ecu would normally register a cat efficiency level and apply corrections based on O2-in/02-out - effectively dictating how rich you can run and maintain emmision control.
you should achieve a base read of 1:1 due to the decat, the ecu reads both as no gain.
put it on the rollers, then measure the emmisions...
if the engine is running weaker due to an internal target table for cat conversion, then you may need to apply a voltage differential to the L2 sensor to make it think its reading a conversion factor..
all this is theoretical as no one has disected the RENIX internals yet (including superchips !)
bottom line is, that, it will probably run great dood.. without any other mods.