The G35c 6MT also has 4 pistons with the fixed disks.

 

The 6-sp coupe has 4-piston fronts and 2-piston rears, same as the Z track. You may have gotten the "2-piston" from the referance of the rear brakes.

 

Ok, in a effort to make absolutely certain that I provide the most accurate info possible. I invested in a dial caliper to take the most accurate readings possible of the springs. I measured them at multiple locations on each springs to further push the "I want to be accurate" issue.

350Z: 347/419 F/R
G35*: 357/407 F/R

*coupe and sport suspended sedans. Non sport sedans are softer.

The rates are different than I'd previously reported, but this is good for 2 reason's. One their with the more accurate wire and inside coil dimensions, the rates are more accurate. And the info I was provided, that the Z and G spring rates are the same, not different, turns out to be pretty much correct. The height differances between the Z and G remains. Any lowering spring designed for the Z will lower a G more. Strut valving remains, allot tighter on the Z however. Something else that interesting, these spring rates are almost the same as the eibach prokit springs for the Z and G sedan.

 

Yet another fact to add to the topic of this thread. The sway bar diameters are the same on the Z, G35 coupe and sedan with sport suspension. Stock front bars are all hollow. I just measured a Z, so that's why this just came to light.

Stock front sway bar diameter for 350Z, G35 coupe, and G35 sedan w/sport suspension = 33mm

Stock rear sway bar diameter same as above = 20mm





The non sport sedan is up in the air since thier's a possibility that either they are smaller than sport versions, or they did change to the same size with the other revisions made for the 2003.5 changes. One thing is for sure some non sport sedans are running around with smaller front sway bars. Any possible rear bar differance is unknown to me. Whenever I get to the dealer I'll crawl under non sport sedan and see what they measure now.