Does G37 has plenum design like previous G35 where we can add spacer to gain more HP&TQ?

 

No. It uses a completely different design and looks like a spacer will not help anything.

 

Do you know this for sure? Increasing the plenum volume is not a new trick - it's been done to a lot of cars in the past prior to the G35.

 

No-one knows anything for sure yet. Looking forward to this myself. Part of the fun of getting a "zero day" car. You need to break it in and get a feel for the stock power before you can appreciate any boost, in my opinion.