So, currently I have an 03 sedan that has non-sport springs and tokico blues shocks. Can I run G35 coupe sport springs on my tokico blues or is this not a good idea? Thanks in advance.

 

you should be fine.

 

Like deemo said you will be fine. You can run any coupe, z or sedan springs u want but your shock life will lower a tad due to the constant compression

 

run the Z springs...IMO those look the best out of the coupes Z or G

 

Oem 2003-2006 sedan non sport spring rates
283/308

Oem 2003-2006 sedan sport spring rates
314/342

Oem 2003-2004 350Z spring rates (unrevised suspension)
314/342*

Oem 2005-2008 350Z spring rates (revised suspension)
314/427"

Oem 2003-2007 G35 coupe spring rates (car's delivered on oem 17/18 inch wheels)
314/342

Oem 200502007 G35 coupe spring rates sport suspension (oem 19 inch wheels)
314/427"

What's the difference between the z springs vs the coupe sport springs?

 

Half an inch shorter all the way around

 

Is there any benefit to upgrading to an oem spring with a higher spring rate without dropping the car? Or is best to drop the car and get a higher spring rate with my current setup?