When o look under my truck i can see the cat. About 2-4" away there is another do hicky . Not sure what it is, can someone help me.

Thanks

 

that first "do-hicky" closest to your manifold is your pre-cat. The second "do-hicky" is your catalytic converter. -Mike-

 

Thanks a bunch, had a feeling it was a dual cat system.

 

I just bought a used 93 F-150 w/ inline 6.(This is my 1st Ford!) My question is this, is there an O2 sensor in the Cat Con area? Truck has over 253,000 miles on it, with a Jasper rebuilt engine w/ 154,000 on it.
Now what I need to know is, can I put the muffler on behind the Cat Con's with an 45 with a tip or do I need to put a full system on?