d16a1si

i just bought a 1991 civic si with the d16a1 engine in it i am not to fimilliar with this engine it has some ***** to it but not fast enough for me (old car was a 91 240 sx with the skyline engine) i want to turbo this engine but not sure what to go with i dont want to change it from obdo to obd1 want to keep the way it is no vtec just want to turbo it please help...................