I read this article about water injectable jackets on a pipe to affect sonic travel, this would allow for people to tune their pipe on the fly by either removing from or adding water to the pipe. Thought it was very interesting, and thought it was worth sharing. Maybe somebody could contact them about doing a pipe design for an LT. That would be awesome! Did I misunderstand the article on this link? 

http://www.factorypipe.com/t_pipetuning.php