As the result of runs under the Automatic Horsepower Factoring System (AHFS) 1.20-second under policy at the Cajun Sports Nationals, the following changes have been made.

The horsepower rating for 2011 Dodge Drag Pak, entries with the 512 cubic inch engine and a factory rating of 450 currently rated at 478, has been increased by twenty one horsepower, to 499 horsepower; for Stock Eliminator.

The horsepower rating for 1986 Chevrolet C-10 truck, entries with the 350 cubic inch engine and a factory rating of 165 currently rated at 173, has been increased by sixteen horsepower, to 189 horsepower; for Stock Eliminator.

NHRA's 2013 Automatic Horsepower Factoring System outlines that any run of 1.20-seconds or more under the index will receive an immediate index decrease or horsepower increase. These changes are effective March 26, 2013.