What is different on the 05 turbo over the 03/04's
 

Ive noticed threw out the forums you dont need the 10.5 hotside on the 05's does this mean they have more power stock then the 03/04s or what does this do?

Obviously. If you look at dynocharts floating everywhere.. You will notice that people with 10.5cm hotsides are making more midrange torque/power than 9cm hotsides that come with 03-04 Evo's. You should really try searching the Evo Turbo/Drivetrain section. There's a lot of info out there....a lot of literature. Good Luck

the 05 evo comes stock with the 10.5 hotside. Also standard front LSD unlike the 03/04 (unless of course its the RS)