6th gen factory springs question
#2
I think physically they are the same, but the stiffness is different due to the v6 being much heavier. I know a lot of aftermarket springs fit either coupe or sedan, the only difference would be the motor you have. I dont know for sure though.
#3
All 6th gen suspensions are the same, coupe or sedan, with the only difference being the slightly stiffer front springs on V6 models. I don't think there is any difference in dampening...I know Koni doesn't sell different shocks for V6 or I4, but who knows.