Are spring insolators needed when lowering a stang? And what's their function? In my case i'm gonna be installing sportlines, please help.....

 

only if your old ones are shot. They are like 40 bucks for front and rear so if your car is more than a few years old pick them up.

 

i would get at least the rears, mine were shot.

 

if i were you, i'd get them. I just put the sportline kit on my GT and my factory isolators were just about shot and my car only has 28,000 on it. What's an extra $40 anyways, never half-*** anything, especially when your puttin a lot of time and money into your car. Do it right the first time and u'll never have any problems. Just my .02