I'm trying to find a way to add a deeper sound to my cat-less e46 m3. i bought the car wit no cats, supersprint headers and the stock muffler about 5months ago. i was looking to buy a system that takes out about 60% of the rasp and add a deeper sound. but i really dont know my options since i dont have cats and i dont know what would fit right on my m without a lot modifications. i been looking for sometime now and cant find notin on google or ebay. can anyone help put this together, any help would be really appreciated.