Found this one on Jegs, but it's pricey.
Racing Coolers 1315S - Racing Coolers Intake Manifold Cooler


Reducing the intake air temperature increases horsepower and the Racing Cooler can reduce your intake manifold temperature by as much as 15 to 20-degrees. The specially designed fire retardant bag holds sealed gel pouches that can be frozen to quickly remove heat from your intake manifold between rounds and helps maintain a cooler intake during quarter-mile passes. The cooler bag and sealed inserts eliminate the mess and worry of leaking plastic ice bags that can damage critical electronics.

Racing Coolers #819-1315S

Mustang 5.0L 1986-95 Intake Manifold Cooler with Strap (OEM & Aftermarket Intake Manifolds)
More Details Was: $198.99
Now: $119.98
Racing Coolers 1315S Details


Cowl hood may be required for additional hood clearance. Cooler kit includes one additional gel pack insert for rotation. This cooler remains on the intake during a run using nylon straps secured with D-rings.