my friend told me (hee works for honda dealer)that the 2003 accord v6 got recalls on the cats because of a nesty odore and they have to ,do a lot off work to fix that including removing rear bumper and sealing some stuff so i say go to a dealer and bi..h about it they gone have to fix it and why you even worry about it 3-36k bumber to bumper get it fix before you warranty expires