Well After speaking to Eibach technician. He told me they have not got any G35X in there laboratory to test out their springs on it. So anyone who is located in California and close to Eibach laboratory. Please feel free to contact Eibach and take your G35X there to some testing. I think they will give you a good discount and leave the spring on your car :-D. Don't take my word on it. I am pretty sure they will do something nice for you.

 

after talking with Salergno45, I opted to take his route with the Tein H-Tech for the 06 Sedan for my 07X. They should be here on Thursday, so I should have them on by the weekend.