Okay so over the weekend I installed Eibach Prokits on my coupe but the height hasn't dropped what so ever! Did I do something wrong? I heard tightening your control arm messes with height but i'm rather confused on that topic. I also did leave the car on jackstands for at least 2 days with the suspension weighed down by rims/tires.
Please help! Thanks!

 

You've got to give new springs 2-3 weeks to settle before you can really judge the ride height. Give her time and if they were installed correctly you should see the drop.

 

what if he has drop springs for a sedan and not the coupe?

 

Dammit I bought the sedan springs -.-

 

What's the difference between sedan and coupe springs?

 

if you install stock coupe springs on a sedan, it will drop, iirc, 1 inch
installing 1 inch sedan drop springs will essentially be same as stock coupe springs

 

Is there any info to back that up? I do not wanna go through the hassle of buying new springs and installing then selling the sedan springs when it ends up being the same thing

 

heres some kinda info
http://my350z.com/forum/g35-g37/4328...-on-a-g35.html
can find you an exact answer though sorry

 

There's info all over this forum. A lot of sedan guys go with coupe springs to drop their cars so you know the coupe springs sit lower than sedans.