More infos:
"Overall, the LS2 and T56 add approximately 200lbs to the BRZ, with most weight actually coming from the transmission. WGP doesn’t feel it to be a significant gain, but still intends to lower it via production version mounts and exhaust over the original version we see here. Just as important, the weight balance now shifts to 56/43, which is just 3% more forward bias than a stock BRZ. But to keep the center of gravity in check, the crankshaft centerline is actually lower than stock, and any sort of handling upset is dialed out with KW coilovers, sway bars, adjustable suspensions, and a lighter wheel/tire package."
In all, I think it can be said that the car is improved (and nothing like a drag-special).