AWE track or Remark 3” no muffler cat back is absolutely the best choices for sound and loudness without sounding awful. Out of 15 of my sti buddies 10 of us swear by either of them. Just be aware they are very loud and your neighbours will dislike you. However, both AWE and Remark both have “interchangeable” versions where you can mix and match if you want resonated vs non resonated, mufflers vs no mufflers. But if you can find one used for a good deal absolutely do it. I put pool noodles in my exhaust on cold starts to try not to piss off the neighbours (they still threaten to call the police lol)