O2 Sensor CEL? Make this!

i installed the part but the CEL shows up about every 100 miles. CEL=cat slow to respond....does that mean its not getting enough flow? should i bore out the hole in the non-fouler?
 
Im getting my downpipe tommorow. Im going to install the foulers and make the hole a little bigger. Ill let everyone know if it works..
 

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