You will get what you pay for MOST of the time I have seen many bad installs from companies who work on police cars and first reponse cars. Anyways not tring to pulg anyone directly I work with some one who does installs and does them right.(he has always been anal about these things)
specialtywarningsystems@yahoo.com is his E-mail he does work for everyone so E-mail him and see what he says(he is in Danbury CT)