yes, u can. i did it. it actually requires no extra parts because the cooland line goes to a hard pipe with a nipple. thus, u can just detach both hoses from the tb, then remove the front hose completely, and attach the back hose to the nipple on the hard pipe where the front hose used to attach. voila! but i dont have an impression on the mod. i just assume it will help out with intake temps.
you'll get more answers about ms6 stuff in the mazdaspeed section, fyi.