Gain is measured at the wheels. AEM posts their dyno sheets on the web when they release a kit for sale.
I know a couple of the engineers at AEM. The company is very hard core about being honest on their published stats. And, they actually publish an average of three pulls, instead of the best one like some companies do.
That's an amazing gain! Ya think it will be similar to the SRT intake setup?
BTW... does anyone ever get a drone from their JoeZ exhaust when just cruising below 2000 rpms..