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New mufflers might be clogged? If they are catalytic even more likely. That seems most likely to me assuming no other changes were made.
 

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Just a shot in the dark based on the scant information.

Did you remove the new mufflers? Did the problem continue? Is the H-box still present?

Suggest to pull the mufflers off. Check for packing material inside the mufflers.
 
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