[Mvy]

Keep in mind that once you mess with Cats, theres no guarantee you wont get a CEL. Its hard to get noticable power differences without touching cats. So you have to work Cat back in order to stay legal and not worry about CELs. You may get away with high flow cats in place of stock cats. You would be likely to throw codes if you went below a 300 cell cat. 200 cells are in the middle and some work without a CEL and others dont. Its hit or miss. You have just a ton of options, and this is so subjective that you will get multiple recommendations. I have a magnaflow set up with resonators. Its not raspy at all as I didnt want that. Its boomy and growly but loud within reason. Borla atak is popular on here and is more raspy.

Check Youtube for m3 exhaust videos to get yourself started and narrow down the choices. Its always best when possible to hear in person.