Honda to Yacht Transformation After Cat Convertor Stolen

I literally went to Home Depot for 30 minutes for gardening supplies and when I came back and started the car my Honda started sounding like a boat. Based on reading this subreddit I had a feeling my catalytic convertor was stolen, I looked under the car and sure enough my convertor was cut clean. Like if you can cut this clean you should work at the HEB meat department and make an honest buck. I always wanted a yacht but this wasn't what I meant. To the point now, what is the best solution to get my new yacht sounding Honda back to normal cost/time effectively?