I am about to install a Sirius radio in my 07 Tacoma and I want to connect the fm reciever to the Toyota radio. I have the fm modulator that connects between the radio and the truck antenna and then to the Sirius.. My question is: do I need an additional adapter to connect the modulator to the stock system. My work van is a GMC and I had to purchase an aditional adapter to hook up the Sirius this way. Also, how much of the dash must be removed to access the antenna and rear of the stock radio? Any help would be great.