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I see no reason for a CEL as long as the secondary cat is left intact. The CEL is only triggered when the post-secondary cat O2 sensor reads too much oxygen because there are no upstream cats. If for some odd reason you do get a CEL for reduced catalyst efficiency a simple anti-fouler/CEL eliminator on the secondary O2 sensor should eliminate the CEL.
Do consider that the cheap anti-foulers are zinc plated mild steel that will rust very quickly and be impossible to remove later on should you need to replace the sensor, etc. IMO it's worth a few dollars to get one in 304ss. Also the angled versions seem to work better than straight ones.
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