Throughout its history, many Ford models have been modified or hot-rodded. Some of the most popular models used by customizers were the Ford Model A, Ford Model B, and Ford Model 18 and 40. These cars were easily available, and simple enough to be worked on by most people, leading to a wave of customized early Fords. The 'Hi-Boy' hot rods are a common example of a well known customization style. Hi-Boy hot rods generally had their fenders removed, and featured a chopped, or modified body. Due to the wide variety and extent of modifications performed, it is very difficult to collectively value this group of cars, requiring close inspection of each example and its provenance in order to determine value. While modified Ford's continued to be built by their owners after 1934, this 'golden era' of hot rods ended when Ford introduced their 1935 Model 48 & 68.