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The interior of Mark's Mustang is dressed in no-frills, business-only attire. Most, if not all, of the stock appointments were heaved in the name of safety, speed, and light weight. Sitting in the back seat is the large-by-huge Spearco intercooler, with its plumbing running along the passenger side. Throw in a 25.5 rollcage; a custom-fabbed dash showcasing only the needed switches, controllers, and a RacePak computer, and you can see this car's true purpose.