Can an aluminum throttle body withstand exhaust heat at the point where the muffler is... its for an exhaustmuffler bypass project...?

Can an aluminum throttle body withstand exhaust heat at the point where the muffler is... its for an exhaustmuffler bypass project...?
The temperature at which Aluminum melts is 1220 F. The exhaust manifold could easily reach 800 F. Further down the line where most mufflers are located, is between 100-300 F. Aluminum would definitely stand up to those temperatures, however the challenge is going to be attempting to weld Aluminum, to mild or stainless steel because they two metals don't mesh. There are different methods which make this union possible, but they are not something a hobbyist should attempt, seek professional advice on that one. I would suggest using an exhaust cut out instead.