OK Guys this might sound dumb. But I just received my new airflow snorkel and want to install this weekend. I understand the whole install but, What the heck and where do i get black mastic. They say when I cut and modify my air box I can only use black mastic. No big deal went to the local Home depot and asked where it was they looked at me funny and said that had asbestos in it and they don't make it anymore. What!!!!! They say thats the only stuff I can use to seal my airbox. They highly discourage the use of silicone. Well any suggestions of what to use and name brands would be a great help. Thanks in advance.