im running a vf43 which is the 07 sti turbo.similar to the vf39 just w an upgraded wastegate, and let me tell u its a lil bad bitch! big diference from the td04 and like LD says with a turbo like this u wont be putting too much stress on the tranny. u can do the install urself w the help of the right tools and maybe a few friends and obviously make sure u got all the right parts and supporting mods to go with.