I was looking for a comparison thread and only found 1, which was done by ISSAM back in 2008.
He compared them side by side on the dyno whiling keeping all of the other variables equal.
Here it shows a 20WHP gain.
However, I feel this subject is WAY over due. So here is my little refresher.
I recently bought an AEB head and then purchase an AGU intake manifold to go with it, which came in today.
On to the pictures.
The physical difference between the 2 manifolds.
Gap between the stock AWP injectors and the AGU manifold injector bungs.
The gap you see above is taken up by un-spacers.
With the un-spacers.
If you are asking why I did this (I know somebody is) the AEB head has larger ports and valves than the AWP head. The AGU Manifold has the same size and shape ports as the AEB head. In short, they are a matching set.
In the thread above done by ISSAM, the small port AWP manifold with a phenolic adapter/spacer, you can see the AGU manifold still made 20 more HP and TQ.
$230 for 20HP/TQ, Yes please.