Helped a mate install one on his silvia, went from side the front.

In short, there wont be any significant improvement until you get the car tuned.
If you are worried about damaging the car (have no desire to get the car retuned) again probably wont have any effect but why spend the money and effort on something that wont make any difference.

I'd also say 99.9% of cars with front mount would have been tuned. And that .1 percent of cars would be stock evo's

__________________
A man in nature;

"All in relation to nothing. Nothing in relation to infinity. A central point to both, And infinitely far from understanding either."