My car is a 2004.5. I thought it didn't have any type of velocity stack; I thought they added that beginning in 2006, then made it bigger on the HR motor in 2007.. Is that right?
So I found a design for a 350z velocity stack on Thingiverse and I 3D printed it out - I didn't even take a peek inside the air box because the file seemed to be the right dimensions. Well went out to the car to test fit the piece and whoa - there's already a velocity stack in there! Looks to be the later, taller one as well. So is that supposed to be there in a 2004? Was I just wrong about when these first appeared in our cars? Maybe I misread the timeline. Or someone swapped it out with a later one? What can you guys tell me?
I'll try and post pictures later.

 

pictures?

 

Velocity Stack can be found in 06 air boxes, Previous years didn't have it.

You can only buy the piece that have the stack for about 85$, Part # is 16526-AC700.

 

How strange because that's what I thought - velocity stacks came in 2006.

Well nonetheless, there's definitely a velocity stack in my airbox on my 2004 (see photo below). Wonder how it got there?.

This is the shorter one for the DE motor - like mine.

Just goes to show that you never really know the history of a car you buy used. Hard to imagine the previous owner (an older woman) replacing her air box. It was sold back to a Nissan dealer from the first owner in 2007 - maybe the dealer did it? First owner?
I guess we'll never know but it's good news anyway.

You can also see the velocity stack I 3D printed - it's the taller one and would have altered the torque curve slightly compared to the one that's in there. I was going to mess around with the different versions I found and see their effect - but I prefer having the right OEM one in there because I'm sure Nissan did some homework on the size/shape of this thing. But if it didn't have a stack, then printing one for less than a buck was a good option.

 

That is not the revised intake.

 

 

 

Ahhhhh dangit!!! I thought you were talking about the lower manifold!

Im out!!!!

cool thread...give 'me hell!!!!

 

OK now I'm even more confused. Is it that in 2006 they gave them the larger stack? And before they had this smaller one like mine? I thought there was no velocity stack at all before 2006.
Were some people calling this smaller one "not a velocity stack" because it wasn't all trumpet-y?

 

Correct.