I just replaced the transmission in a 98 deville, it will start up and drive, but i have a problem, the cooling fans turn on hi, and the info center won display coolant temp or oil life. I cant seem to connect to the PCM either, The Info center keeps displaying this Theft system problem message that i cant seem to get past any help is appreciated, Also I thought i might include some pics of the motor and trans enjoiy.

http://i173.photobucket.com/albums/w63/91parkave/th_100_0090.jpg (http://s173.photobucket.com/albums/w63/91parkave/?action=view&current=100_0090.flv)

this is the down pipe that measure 2.25 For the outlet....For all 8 cylinders....2.25...You could however run true duals contrary to whats been said on this forum, and yes i could see some really good gains if this were to be done.
http://i173.photobucket.com/albums/w63/91parkave/DSCN0478.jpg
http://i173.photobucket.com/albums/w63/91parkave/DSCN0477.jpg
http://i173.photobucket.com/albums/w63/91parkave/DSCN0476.jpg
http://i173.photobucket.com/albums/w63/91parkave/DSCN0473.jpg
http://i173.photobucket.com/albums/w63/91parkave/CIMG0810.jpg

anyone?