Any differential upgrades?
 

I know there's the Fullblown 8.8'' rear end upgrade. Comes with axles, diff, and driveshaft. Anyone know of anything in the works aiming to support high horsepower/torque numbers?

It appears they don't have anything out yet, but DriveShaftShop makes axles and driveshafts for most vehicles. I can't see why they wouldn't be interested in the FRSBRZ market... so maybe they'll have stuff coming in the future?