The 2006 Acura RSX is a 2-door, 4-seat Coupe, available in 5 trims, ranging from the Base (A5) to the Type S (M6). Upon introduction, the $21,225 Base (A5) is equipped with a standard 2.0L, 4-cylinder, engine that achieves 25-mpg in the city and 34-mpg on the highway. an Automatic transmission is standard. The $23,845 Type S (M6) is equipped with a standard 2.0L, 4-cylinder, engine that achieves 23-mpg in the city and 31-mpg on the highway. a Manual transmission is standard.