i have a old viper model 300, all the shit is installed and that why it would be easier just to activate it rather than getting a whole new one, catch 22, my cousin lost the remote transmitter before she sold it to me and rather then paying for a new one and programming it can i just buy another whole system(same model with a remote) and swap brain then will it work, or is there a receiver some where else to pick up the remote transmission?