The H&R's are WAY too low on the 07+'s though.
I think the Eibachs height is just what I was looking for.

heres my other question...what about g37 coupe springs on an X. I cant find any info. Would the change in spring rate for the heavier 3.7L somewhat balance the extra weight of the X?

I wish we could get the actual specs on OE springs.
I looked into most of them when I was playing with the 370z springs.
I couldn't find any real data.

i cant either. any input on using 07+ G35S springs vs G37 coupe springs vs G37S Sedan springs?

^^ i might have some input shortly. I have an 09 g37X and am in the process of getting the coupe S springs. might take a couple weeks to get them/install them. But ill keep you posted.
If anyone can provide some advice beforehand, that would be helpful

IgS

The G35S springs height are: (max tip to tip)
Front = 13-3/8"
Rear = 13"

From when I was playing with the 370Z springs,
I was told that the G37S coupe springs were about the same.
IDK for sure though.

thank you. now i just need the X coil measurements