this MCACN barnfind '73 Citroën SM was extensively modified by prior owner

Bob Diemert was a self-educated engineer known in the aviation world for his meticulous restorations of  a Hawker Hurricane fighter (one of only 5 in existence!) and two Japanese Zero fighters.

He applied his aviation know-how and ingenuity to this SM, in some cases to increase its performance and in others, for reasons unknown.

he overcame the absence of the car’s original triple Weber carburetor setup by designing and fabricating a new intake manifold to adapt a Marvel-Schebler Ha-6 carburetor borrowed from a 1968 Beechcraft 23 Musketeer. To significantly increase power output from the SM’s V6 Maserati engine he added an AiResearch T04 turbocharger and nitrous oxide system.

https://www.hemmings.com/stories/barn-finds-hidden-gems-at-the-2025-mcacn-car-show