okay, i have either a 2 1/2 or a 2 1/4 dual pipe no mufflers co cats coming from the sides in front of my back tires. i just got the car and it came like that. i am looking for somehting much quiter and with more back pressure. i have been shopping around na deveryone is confused or something. I was told by one person to just put on to flowmasters and a cat for more pressure. from someone else i waas told to just put single pipe 3 inch with a dynomax super muffler and that is it or if i want a dynomax muffelr super with 3" with cat.any suggestions, pleae help i am dying to know what to do i have to figure it out in the next towo days. someone please help. thanksssssssssss