Westen Champlin’s Mustang build didn’t start with an engine — it started with a family of rats living in the engine bay. What followed was a fully built 2,000-horsepower big block, a fabrication job that pushed the Mustang’s chassis to its limits, and a viral moment involving an unexpected Camaro joke. With more than 11.5 million views, it’s become one of the biggest builds this channel has ever released. See how a rodent eviction turned into one of the year’s most talked-about engine swaps.