
Chapter 04 · Nationwide
The Birth of the Aftermarket
Illustrative image · AI-generated, not a historical photograph
How home-built modifications became manufactured products — and an industry.
Every speed part began as a problem someone wanted to solve. A racer cast a better intake manifold, a friend asked for one, then a club, then a region. Many of the best-known names in performance parts began exactly that way.
These stories trace the path from backyard experiment to catalog item, and the trade association that eventually gave the specialty-equipment industry a collective voice.

From Garage to Catalog
How the Model T and the flathead Ford V8 gave rise to the first generation of speed equipment makers.
IllustrationThe Overhead-Valve V8 Revolution
Postwar engines from Cadillac, Oldsmobile, Chrysler, and Chevrolet changed what hot rodders could build.
Read · 5 min
Illustration1963: The Industry Organizes
The founding of SEMA gave speed equipment manufacturers a shared voice on standards, safety, and trade.
Read · 4 minOther chapters