American Racing Headers hit the Mustang market hard with a full line of headers and exhaust components for S197 Mustangs, and we hadn't used them up till this article, either. The headers' fit and finish and ease of installation are top notch. Of course, with the modular engines, nothing's really easy about installing headers. The stainless steel headers look awesome, and 3/8-inch-thick flanges mean they won't leak either. Furthermore, the corresponding X-shape crossover pipe matched the quality of the headers.