My favorite modification is always used on Independence Day, the holiday not the film.
My custom high-volume high-pressure air system provides "unlimited" continuous-duty air to supply my Kahlenberg D-1 cruise ship horns and my Kahlenberg 117 tug boat whistle.
After the fireworks finale the USCG regulations require all nearby vessels to sound their horns. I let everyone else have a turn, then let my whistle rip, followed by my horns. There is nothing else to say after that...
The massive sound reverberates off the coastline.
http://vid101.photobucket.com/albums/m52/wingless-pics/Boat/Air/Air%20Horn%20Test.mp4
