Benyahia was born in Miami of a Moroccan father and a Belgian mother. His father, Karim Benyahia is a businessman in hands-free technologies. His mother, Pascale Van Cleemput was Honorary Consul of Belgium in Miami between 2002 and 2005.
Benyahia began karting in 2007 at the age of seven, claiming numerous titles in his career.
In November 2013, he took part in the Rotax Max Challenge Grand Finals held in New Orleans where he finished sixth of the Mini Max category.
Benyahia is one of four confirmed drivers that will drive two McLaren 570S GT4s for Tolman Motorsport for the 2020 season, after he, Katie Milner, Harry Hayek and Alain Valente were the top 4 drivers in an 18-driver selection at Snetterton.