Your cat is unlikely clogged. If it was you would be failing smog left and right.

Swap EHA.

On a side note, don't put any of that stop leak junk in the crankcase. Just gotta fix the bad seal wherever it is. No way around it.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k