Actually, Eugene...
For the RX-7...it depends totally on the application. For an everyday driver..used primarily for track events, an SMIC is much better, and prevents overheat due to the extreme heat generated by the rotary.
An FMIC will block the radiator, and prevent proper cooling...people running high amounts of boost on a continuous basis will have temperature problems.
Now on the other hand, if you're only jumping on the throttle on short runs such as drag racing, or daily cruises that you don't get on it much, an FMIC is acceptable.
A new application called the V-mount is being produced that allows the radiator and FMIC to both recieve the same amount of airflow...but it's gonna be pretty expensive.
An FMIC looks badazz..but in the 7's case..an SMIC is a better application.