He was also considered an advisor and expert on the 911 by Alois Ruf, a respected Porsche tuner and manufacturer as head of Ruf Automobile, who consulted Frère during the development of Ruf's RGT8 Model.
Tamén foi considerado un conselleiro e un experto no 911 por Alois Ruf, un respectado tuneador de Porsche e xefe da fabrica Ruf Automobile, quen consultou a Frère durante o desenvolvemento do modelo RGT8 de Ruf.