OBD II will be messed up. Buy new ones, they are not very expensive. If they have failed you have other problems that need to adressed before getting rid of them. Very little performance would be gained by removing them unless you have major computer mods.
You will throw the pcm into a tail spin.Fuel management will be affected in a negative way and the SES lamp will blare away at you with a p0420.Even with heated post 02 sensors,a cold cat will trigger a dtc.
From the sounds of other posters, I'd guess this is a speed-density EFI system. MAF systems aren't sensative to changes in exhaust flow since the MAF will compensate for the improved volumetric efficiency. However, OBDII systems have a pre cat and post cat O2 sensor in each bank. If the post O2 doesn't see a reduction in CO / NO2 it will throw an error as others have stated.
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