How do you know when the cats are pluged? What kind of noticable signs would their be?

 

Depends on how bad is clogged
-you can look under and it may be red hot
-lack of power/acceleration
-if real bad the truck will be running really hot
-could get as bad as hesitation and stalling when trying to drive and may not be able to drive at all.
-may feel like it is starved for fuel

im sure there is a few more but if its plugged it will run like crap