I do not have the factory sub and I am not sure why a Tahoe sub will not fit in the factory location. i cannot seem to find a premade or formed box to fit in this location. Will the Tahoe factory sub fit in this location. I have looked behind the rear cover and there is plenty of room, the only thing that I see might be as an issue is the back of the fuel filler lines. Any ideas or known of any others that have been able to fit something in there? I am even up to getting a factory sub and replacing the woofer.