So I e-mailed Brenspeed.com yesterday asking some dimensions on the MAC x-pipe for a 05 GT. No reply as of yet. Ive done alot of measuring and comparing, Im sure that a GT x or h pipe will slip right on our cut y-pipes. There are alot of x and h pipes that sell for as little as $70 for a universal kit to $500 for a stainless steel cat'ed kit. I have everything I need except for the x-pipe. Im ordering it as soon as I get a reply from Brenspeed.