In early 60’s Mr. Norm started Grand Spaulding Dodge that started modifying Dodges into true muscle cars. He soon found out that “Race on Sunday – Sell on Monday” works. When his customers or even his own team went drag racing his dealership sales increased the next few days. And when Dodge saw the same results they allowed Norm to modify their cars without any warranty penalties.
The Mr. Norm builds continue to today. See his website for modern muscle cars.