Is it possible to make my car a turbo???? If so what do I need to make it one
right now it is a 1991 RX7 convertible non turbo.

 

theres a search option on the top bar. it'll find all the info you need. this same question has been covered many many times. gotta do your homework before trying to do a swap like this because it involves a lot more than people think

 

If you must...
http://aaroncake.net/RX-7/naturbo.htm