im thinking of selling my 2004 bone stock silver cobra w/dark inserts. it has 15,000 miles and the only mod is a bassani catback never been pullied still has original goodyear tires. i wanna no what i can get for it ive seen them with 30,000 miles going between 26-31k. i also have a 6year/75,000 miles ford certified warranty. tell me what u guys think its worth