Hmmm : Is this the way it's supposed to be?
 

2005 G35 Coupe...

The drivers seat has a hump down the center of the seat where you sit...
The passengers seat is flat - no hump!

Do I have seats from 2 different years, is this normal or a sign of the prior owner's issues?

What is proper for a 2005 G coupe to have - 2 humped or 2 flat seats???

Thx!
PB

^Yes. Its normal.

Driving the G requires extra support for your genitals!:BOUNCE::BOUNCE:

I think your referring to the lumbar support. There should be a handle on the right hand side of the drivers seat (above the center console). Moving this either pushes out, or pushes in your lumbar support.

I have a 2003 and my G has the same seats as yours. Driver's cushion has a hump and the passenger's is humpless. :D

Not what he's talking about. OP that's completely normal, it's designed to give the driver more support since he's in control of the vehicle. All the passenger has to do is just sit there!!

Yup normal. Its to keep your balls from riding up into your stomach when u hit crazy g's in your g...Wow this might be the stupidest thing I have ever typed but I'm gonna submit it anyways. Lets hear it for boredom.

Hmm, I've never noticed this. Need to check it out :D Thanks!