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You have 2 symptoms that both say it is the catalytic converter. 1 is that it is bogging and won't go and 2 is that you have a hard brake pedal from no vacuum in the brake booster also caused by a restriction in the exhaust. Did you have the converter replaced at a dealership with a genuine Kia part as part of a recall?
 

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Your exhaust is clogged, most likely by a catalytic converter where the "honeycombs" broke loose and turned into rocks and powder (they literally look like honeycombs inside). Go back to the dealer that you had it done at and see if they can warranty it out for you.
 
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