Here is a library of information about the various Civic Si models that have been released throughout the years.
The Civic Si was first introduced in the US in 1985, and continues to this day. It had a brief hiatus in the mid-late 1990's, but has since come back and has proven just as popular as ever. The various models have evolved over the years with the Civic gradually growing into a larger vehicle. In general newer Sis are more powerful but also more heavy. The older Civic Sis are very popular with tuners due to the wide variety of parts available, but also due to the good looks and design features of these cars.