Provide details then and state what youve concluded so far. Otherwise, you.just cone off as another member who doesnt research and expects others to do it all for them. This has been asled and covered well enough several times within the last year or two, which is current, so keep searching.
Im personally against Yonakas because their most common complaint is that they rust alot within just a year or two. I believe MagnaFlow mufflers sound well with Si engines. Theres another brand or two that sound good on Hondas but I dont recall at the moment. Search through some YouTube clips as well. Ill reply if I remember those brands.
I must add that if your motor isnt modified, save money and leave the pipes alone. Just get a good quality muffler.