is there any bad impact of install a spring to a stock suspension? Because i just want to lower than car for looking. Don't want to spend money on the new sets of suspension.

 

It will wear your struts faster than normal. How much depends on the stiffness of the spring and how much it lowers. The stiffer and the more it drops, the faster the acceleration of your strut wear. Slamming a car really low also puts additional stress on every suspension component as the geometry of how the suspension was designed has been changed.

Bottom line is a small drop only affects it a little. Slamming it will wear everything out much faster.

 

I got S-techs for sale if you want, PM me

 

get coilovers

 

my g35 shocks lasted over 50k miles with a 1" drop before i wrecked it.