I don't think the transmission can handle the power you have now.
The factory engine wasn't designed for a turbo. A turbo would have a stronger crank shaft, rods and better pistons. The rest of the drive train would also be stronger.
The best way would be to trade it in for a more powerful car, which would be almost any car. My Accord which you don't think of being fast, is so much quicker than my Fiesta was. Each horse has five less pound to hall around. As for gas milage, which is the only reason I can think of why people buy a Fiesta, my Accord is only about 10% less in the summer and the same in the winter. I know a Fiesta and an Accord aren't really comparable, but that's what I traded my Fiesta in on. My Fiesta was the worst car I ever had to my Accord which is the best.