Unless you are flying into and out of controlled airspace like class C and such. I would ditch the transponder if you are trying to save cash. First it will need to be certified before it can go into service. That is a few hundred bucks. I would also, but this is just me, throw the BRS in the trash. If you really need it, by a new one. They do not have the rockets in them anymore, they use something else and not rockets that could explode. If you do want that one redone it's a hassle just shipping it because of the rocket in it.