Yes it sounds like debris. I'm not sure what model he installed. They are closed today otherwise I'd call and find out.

He left the precat shells in place -- but instead of putting new precats in, he simply cut through them so its straight through at the front. I essentially have one cat now.

Maybe I should give it a good long Italian tune up on the freeway first to see if I can blow out (possibly) anything left over in there.

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