Bold move, I did the same with my truck, pulled everything in anticipation of my fancy stainless MagnaFlow exhausts arrival as per tracking. UPS "miss-sorted" and it ended up in Rockland Maine, I don't live in Maine... I have a truck up in the air for a few more days.
Get these, way better than silicone paste and a plastic bag.
https://www.gen5diy.com/products/16-...-exhaust-plugs