Corsa is considering manufacturing an exhaust for the 2004 GTO for use with the 2005 rear facia. If anyone is interested in this set up please call or email Corsa at 1-800-486-0999 or www.corsaperformance.com The more people that call the better chance we have of getting it built. Just think you could make your 2004 GTO look like a new 2005 GTO. The 2005 GTO rear end looks a heck of a lot better than the 2004 rear. Not to mention Corsa will have a life time warranty to go along with the system. MAKE SURE YOU TELL THEM YOU SAW THIS POST ON THE WEB!