Found this comprehensive article on how performance boxes work. Lot's of good "always wanted to know" info and the latest power box info. Geared towards 03-04 HPCR Dodge Cummins Turbo Diesel engines.

Fueling Box Summary (http://www.nwbombers.com/membersites/doug/fueling_box_summary.htm)Edited by: hoot

Thanks hoot.