I remember reading somewhere that g37 has equal length OEM exhaust manifold.
Does someone have picture to prove or unprove this?
Thanks

 

Two of the three are. The only difference between the aftermarket ones, Stillen, etc is the path of the cylinder closest to the driver is shorter. Many threads on headers. Search may help.

 

They couldn't be equal because once you add the Stillen headers (which ARE equal length) it totally changes the exhaust tone. It no longer has the VQ grunt to it. I really hope Fast Intentions go with unequal length headers because it would make the car sound that much better.