Well I went with an american thunder cat-back for my cobra once I saw that a dynomax ultra flow race magnum setup is $480. I know I won't get rid of all the metallic sound, but at least having a full cat-back on now should get rid of a lot of that horrible resonating sound. If this doesn't fix it, I am going to shoot someone, then guy buy an O/R H-pipe, put that on, and hope my friend with a 98 Cobra will want my X-pipe.