On the 3.7 Roadsters the only intake for air is via a hole cut onto the base of the Mustang airbox / filter housing here..
It's not very large in area and draws intake air from close to the back of the engine and the footwell bulkhead, and is only about 6 inches from the hot exhaust manifold
The filter sits flat in the top of the airbox & there's plenty of space below...
So I've cut some additional intake holes below the filter line to allow more air routes in, and hopefully some will be cooler air pushed in by the forward facing bonnet louvres, and I'm lining the 'box' with reflective foil tape
Next task is an air scoop to the back of the bonnet side louvres or a Naca duct
