Pro Modified
Pro Modified, commonly called Pro Mod, is a popular drag racing class featuring highly customized race cars that look like production vehicles but are powered by extremely powerful engines producing up to 4,000 horsepower and capable of speeds exceeding 250 mph.
Pro Modified racing began in the United Kingdom in 1988 and quickly spread to the United States when the International Hot Rod Association (IHRA) introduced the class in 1989. Today, approximately 600 Pro Mod cars compete at tracks around the world, making it one of drag racing's most exciting and accessible professional categories.
What makes Pro Modified unique is the variety of engine configurations allowed under the rules. Teams can choose between three main setups: forced induction engines using turbochargers or superchargers, which are limited to 526 cubic inches and must weigh at least 2,650 pounds with the driver, or naturally aspirated engines running nitrous oxide, which can be as large as 960 cubic inches but must weigh at least 2,425 pounds with the driver. Forced induction cars burn methanol fuel, while nitrous cars use high-octane racing gasoline.
The cars themselves are built on custom-fabricated chassis made from 4130 chrome moly tubing, with a maximum wheelbase of 115 inches. Despite having bodies that resemble street cars like Camaros, Corvettes, and Mustangs, these are purpose-built race machines underneath. Pro Mod cars feature either a forward-facing hood scoop for nitrous-injected vehicles or a cut hood to accommodate superchargers on blown engines. A large, flat rear wing provides downforce to keep the car stable at high speeds.
Pro Modified cars compete on both quarter-mile and eighth-mile drag strips. When racing on a quarter-mile track, as typically used by the National Hot Rod Association (NHRA), Pro Mods complete passes in approximately five to six seconds. On eighth-mile tracks, such as those used by the Professional Drag Racers Association (PDRA), passes take three to four seconds.
The rules governing Pro Modified are intentionally more lenient than other professional drag racing classes, giving teams significant freedom to experiment and innovate. This flexibility allows racers to continually push the boundaries of performance while keeping costs more manageable than top-tier classes like Top Fuel or Funny Car.
Pro Mod cars use specialized racing tires that look similar to automotive tires but are engineered specifically for the extreme forces of drag racing. Every component, from the engine to the suspension to the body panels, is designed to maximize straight-line acceleration and stability.
The combination of diverse engine options, recognizable body styles, and relatively open rules has made Pro Modified one of the most popular spectator classes in drag racing, offering close competition and dramatic side-by-side racing action.