The Mazda cx7 is not as good as the Rx7. The Rx7 has more power, better fuel efficiency and a sleeker appearance. The Cx7 is actually not as good as a Honda CR-7.
the Mazda 3i has a 2.0 liter engine and the 3s has a larger engine (2009 and earlier had a 2.3L and 2010 has a 2.5L 4 cylinder motor) The 3i is only available in the sedan version but the 3s is...