has any1 purchased from ebay dual exhuast

i got a 1999 honda accord i4 nd im looking to put dual exhuast on to it. i see ebay how a bunch of the same kits for it, they all are bolt no to the cat. has any1 every done this but ordered from a differnt site? also any1 have any suggestions on exhuast tips? i like the n1 style but i dont want that ricey loud sound i want a nice low deep tone to it. also i should see hp gain from it also correct? any1 know how much around? thanks  guys for your help, trying to learn as much possible.