Well since I had my car I thought the stock cat was gutted. I got under today and looked at it and it says Made in USA then says Vibrant Power INC. So its a vibrant brand cat. I have this along with a pacesettr header. Imma bout to throw a stock GST muffler on there hope it will make it quieter. ALthough I am looking for a deeper tone. Will stock be the best way to go?