if you put a 2.3 turbo in a mustang you will get better gas mileage and you can beat a stock 5.0 with little mods. You can get 400+ pretty easily out of these motor. Then over that it gets pricey just like a 5.0.
i have a 88 turbo coupe it weighs about 3600 pounds with me in it. And i can beat stock 5.0s all the time. I beat a couple of cobras on the highway. My car is not stock though.
I also have a 2.3 turbo in a 91 ranger hence my name. It is bone stock non-intercooled at the moment. Will be adding lots of parts coming soon.
I already have
total seal rings
msd 6al w/ two step and boost timing master
holset hy35 turbo
heavily ported & polished head with big valves,roller cam,double valve springs.