My Ghia doesn't really have great airflow over the decklid that could be used for an air-to-air and be efficient by getting good airflow. I've researched the A/W coolers extensively and decided that it would be the best way for me to fly in spite of potential drawbacks. Plus...
Our latest Touareg and Cayenne Hybrids use a pair of A/W unit for packaging and efficiency purposes.
The supercharged V6 in the latest Audi's use one (2 actually)
The LS9 in the Corvette uses one (pair)...
The RUF 4300K supercharged Cayman uses one(pair)...
The new turbocharged Segway uses one....
http://www.bellintercoolers.com/page...FAQ.html#FAQ_5
http://www.frozenboost.com/product_i...roducts_id=219
So I vote for the A/W unit.