Need some sugestions!

Hey my name is Konstantin, and i have a 2003 VW GTI 1.8t, its a great car, i love everything about it, i have one problem tho, it has an automatic transmission  but i would really like to add some hp to it, but im too scared that its going to kill the transmission, so i was just wondering if anyone had any suggestions on what i could add to my car that would raise the hp, without killing the trans.?