Hey all. I currently have a b18 swapped EF hatch. For exhaust i have the DC sports headers, a 2.5" high-flow cat, and 2.5 inc no-name brand cat back with can style muffler that was on it when i purchased it. I had left the 2.5" exhaust because i was planning on boost in the future, but now I changed my mind and decided that I don't need (and probably can't afford) the power and I'm aiming to just make a reliable daily / weekend autocross car. Anyway, my exhaust is just way to loud and I'm looking to replace it in the future and had a few questions. I'm currently looking in to getting either an ES oval and having a cat back fabricated or purchasing the Invidia N1 cat back. Would this quiet my car at all? I was also thinking about dropping down to 2 1/4" piping. Would this provide any benefit? It's been my understanding that 2.5" piping is to big for non-turbo applications and doesn't provide optimal flow. I also figured the smaller pipe might quiet her down a little bit. About the cat, Should i also look in to getting a smaller cat? Is the 2.5 cat if I get smaller piping for the cat back? Anyone have any other advice or input?