I looked at it pretty hard when I was doing my upgrades. It's is a VERY expensive proposition. Almost better off going for trade in depending on what all you have done. I ended up going with the t-56 tremec magnum because that was expensive but to swap to Auto was going to be way more. Wiring, computer, interior... just make sure research with a good shop about all involved.
Brembo Pkg, Paxton SC, ID1000's, JMS BAP, Boss IM, JLT CAI, Lund Tuned, Tremec T56 swap, Black Pype Bombs, Pypes LT Headers H-Pipe, McLeod RXT Twin Clutch & LW Flywheel. Alum. DS, MGW Shifter, BMR adj. Panhard, UCA & LCA's, Eibach Pro Damper, Sportline Springs, MMD Louvers, Roush splitters, RTR decklid and surround, CDC Grille, Staggered 20" ACE Alloy Driven, Trufiber Hood.