How do you know they are clogged? Summit Racing sells high flow cats that will work great for your truck. You can also remove them if your state or county doesn't do emissions testing. You will need 2 dummy O2 sensors that go behing your missing cats so you don't have a check engine light. You can find them online for $99 a piece. I would run 3" true dual exhaust w/ your choice of high flow mufflers, and of course have "The Mad Doctor" adjust your tunes.
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2nd place is 1st's loser!
2012 FX4 Waldoch M80 Edition Supercrew, 3.5L Ecoboost, Flowmaster Exhaust, K&N Air Filter, Road Armor Grill Guard, huge smile! 
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