NASA’s American Iron series is pretty hardcore to begin with – Camaros and Mustangs battling it out wheel to wheel on road race tracks – but what if AI’s strictly-enforced 9 pounds per horsepower weight minimum is just too restrictive? Well, then you step up to the American Iron Extreme class, which has no horsepower or torque limit, like Modular Depot’s Greg Brown did. On 100% methanol and 19 pounds of boost, the Ford Racing Aluminator short block with 4V ported heads, cams, and Whipple Supercharger made 650 horsepower to the rear wheels. That wasn’t enough, though, and Brown added a Snow Performance water injection system – with no other changes, output jumped to 675 at the tires! Watch how his 1986 Mustang eats the “regular” American Iron competitors ahead of him alive on the long straights in this clip from Virginia International Raceway this past July:

Water injection is a perfect charge cooling solution for this application, since air to air intercoolers are impractical for screw blowers like the Whipple setup, and the typical air to water system quickly heat-soaks, even if the reservoir is stuffed with ice before the warm-up lap. With the Snow water injection system, endurance is limited only by the amount of water in the tank, which can be sized to match the available fuel supply without being unreasonably large or heavy.