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Just wanted to know if anyone changed their seats, (graphite/heated stock) where the middle portion where you sit as well as where you rest your back has be changed to suede if thats even possible or can that area be dyed and the imperfections (infamous bubble) in the leather be removed?
It's possible and pretty common when fully modifying cars, however I do not think any G37 owners have done this, I'm pretty confident you will get more info/pictures/members/who have done this on the G35 sister site.
I'd start with searching upholstery shops local to you. It isn't a difficult task for experienced shops to do so I'd go with anyone giving a decent price, not too high, but not dirt cheap either. They should have pictures of their work, employees who have done their own work, or even cars locally done who could come down and show you the quality of work they received.
If you'd like references, I'd try posting this topic on G35Driver, I'm sure the guys there will be eager to help you out as much as they can.
Member SRG posted some pictures of the G of a friend of his a while back. The interior was completely re-done. I tried searching but couldn't find the thread, but, in short, the answer is yes, this can and has been done...