It goes between the filter and the tube.
I've heard it doesn't do much and I've heard oem comes with it ( maybe not all years since my 03 didn't have it).

Personally I don't think it's worth $50.

 

The OEM is built into the filter. It's nothing like the BPi but it's better than not having it.

A velocity stack can go where ever air is being sucked into a pipe. So at the end of an intake, at the end of the runners in an intake manifold or at the end of ITB's.

 

Im not entirely sure how effective they are but from a quick research, it seems like a pretty good idea to have... At first geuss i feel like it would make sense to put it right infront of the Intake Manifold like you have it set up. Im surprised no one has just made a cheap version of it if its so simple. 50+ is kinda step for something so simple...

 

Not quite sure I know what a quarter round stack is ?

Here are some pic's of mine(6"o.d. down to 3 1/2"o.d.)

http://s188.photobucket.com/albums/z38/rodrounds/Intake/?action=view&current=roundsintake1-1.jpg#!oZZ1QQcurrentZZhttp%3A%2F%2Fs188.photobucke t.com%2Falbums%2Fz38%2Frodrounds%2FIntake%2F%3Fact ion%3Dview%26current%3Droundsintake1-1.jpg

ROD

 

rod how does that work for ya? good power gains? good for a dd??

 

On my S/C V6 it works to free up some hp and on a N/A engine it works even better. You won't find a engine on a dyno without one, velocity stacks have been around for over 60 years because they work N/A, S/C or T/C. One thing I don't like is the sound, its hard to hide it especially if your F/I. I like to try to keep it stealthy.

ROD

 

They're not simple to get right. The guy that designed the BPi did a LOT of flow testing to get his right.

 

Anyone have a velocity stack in a AEM v2?!