2011 Mustang Stock Airbox Mod
Similar to factory 2005/2006 GTO an approximate 1.25 inch hole is cut in the side of the airbox to pull additional air from the fender area. Note on the Mustang this is still fairly well insulated from a majority of the hot engine air and pulls cold air mostly from the stock CAI duct. Tools used include a 1 inch hole saw, dremel and 1 3/16 socket for final template outline. I don't think it gains much but really sounds good in combination with the sound tube and resonator delete. Take time to measure and cut the hole in stages. Finally sand off the rough edges.