Why do a 5-lug conversion...

5 lugs provide more power to be turned through the rear wheels.
5 lugs allow MORE rim and brake choices..like 13in Cobra or Baer brakes
5 lugs are standard on any car, why is the fox mustang different?
5 lugs look better IMO
5 lugs......
 
The only reason Im saying anything about running 4 lug is because I got da wheel covers. :D
Any fox besides a cobra, u know its gotta be 5 lug. I cant understand what Ford was thinking with that.
 
regardless of a 5 lug axle being stronger, if you break an axle it will most likely be at the splines. you'll twist and break splines before you snap a lug off.

from what i've seen, 99% of the time, people do the 5 lug conversion for either cobra brakes or new wheels.
 
You can answer your own question here.

What is good about your stock 4 lug setup?

hrm.................... well it is there and I have wheels and tires already.

Now do a search on 5 lug and benefits to compare the pros on converting to the pros on what you have.