AMS said the gain are throughout the powerband.
I'm looking for the low & midrange improvement.
Currently running AMS 3076 turbo w/ AEM & HKS 272/272, soon to be added alky.

 

TurboTrix might be able to chime in since they installed one on their shop car.

 

It is the best intake manifold on the market

I tested BJ and Magnus and the AMS is vastly superior to either

I do not have good dyno numbers as I am constantly changing my set up and have no real a- b test to show

I have an indea though with Shep - TT and myself all changing over to the AMS manifold it is doing a decent job

 

Not to mention we spent more time developing the packaging materials for it than some did developing their intake manifold! The quality, fit and finish, and performance are 2nd to none. I really don't think anything out there can hold a candle to it.

 

I have no doubt of the gain in the top end, it's the low & mid range I'm most interested.