Engines are nothing more than elaborate air pumps, and as such they rely on a steady supply of air and fuel. The fuel side is fairly straightforward, but often times an engine's potential is choked down by an inadequate supply of air. Another issue is the design of the carburetor-topped engine, which lends itself to drawing in the hot air that rises up directly over an operating engine.
Spectre Performance saw these deficiencies and decided to design a simple-to-install kit that would help feed hungry V-8 mills with not only more air, but air that is cooler and thus better for churning out power. For lower horsepower cars they offer a system that utilizes a single intake tube and filter. For more powerful mills they also sell a system with dual intake tubes and filters. In both kits the filter is relocated from the hot area directly above the carb to the far front corners of the engine bay. We should note that most engines really won't see a benefit from the increase in air flow since the air supplied by a typical round air filter is sufficient. However, all engines should see a significant gain from being fed cooler air.