The problem with that Spectre unit is that it destroys the airflow through the throttle bores. Even with the FiTech and Sniper, the venturi through the throttle bores behaves the same as a carburetor. Straight, laminar flow through the throttle bores fills the plenum in a way that shortens the turn from the bottom of the throttle bores to the runners.
While yes you may be grabbing cooler air for the engine to use, the way in which the air is being used is much less efficient. The hat is simply too close to the throttle bore entrance and it disrupts the flow of air. From a power perspective, you're better off taking hotter air from a traditional style air cleaner.
On my FiTech unit I use an edelbrock 3" gauze filter with filter lid. It's not really a drop base, but the design is such that the total height from carb flange is only 3.5", which is among the shorter options available without custom modification.
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-Jason
1969 Pontiac Firebird
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