[94PreludeJDM]

I'm not an expert by any means so anyone feel free to correct me if I'm wrong. As fas as the headers, I've read a lot of things they say the prelude has good quality headers already, unless you want to spend the grand or so to get mugen or smsp headers (DC sports are apparently a waste for preludes). I've also seen that JDM headers are the best bang for your buck. Dual mufflers I think would hurt your performance, not help it, because you won't have any back pressure. As far as the high flow cat, I'm not sure, I've actually wondered the same thing, so I hope someone can answer that. So I guess a simple answer to your question is that a more freely flowing exhaust system is going to give you better performance, especially on a built engine.