I dont know if this is normal but after I drive my car and get home and turn off the engine....the cat is kind of giving off some smoke near the header part...I dont know if my car is just cooling down or is there something wrong with my cat??

 

this could be a million things, did you check for a leak? how much smoke is coming off? need more specifics

 

you might be leaking oil, have you changed your filter out recently?

 

just got my oil changed recently and there isnt a lot of smoke but enough to get me worried....so it might be my oil filter??

 

Make sure your filter is on tight enough. You may just have a little bit of oil still on the downpiping or whatever its called. Each time I changed my oil, some would drip onto the piping causing it to smoke after I shut off my car.