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

The horsepower rating for 09-10 Dodge Drag Pak entries with the 360 cubic inch engine and a factory rating of 275 currently rated at 328 has been increased by eleven horsepower, to 339 horsepower; for Stock Eliminator.

The horsepower rating for the 2012 Ford Cobra Jet entries with the 330 cubic inch engine and a factory rating of 450 currently rated at 456 has been increased by twenty horsepower to, to 476; for SS Eliminator.

NHRA's 2013 Automatic Horsepower Factoring System outlines that any run of 1.20-second or more under the index will receive an immediate index decrease or horsepower increase. These changes are effective Sep. 24, 2013.