Halltech 2015-16 Corvette C7 Z06 Stinger-RZ™ has been dyno tested by no less than 20 independent shops, including GM dealerships. They have reported between 40 and 55 RWHP with this CAD developed intake system on the chassis dyno. Installation is the key to getting everything to fit however. Halltech is now installing each intake on the company C7 Z06 to assure proper fitment. We highly recommend professional installation. The airbox is sealed, but is much larger than stock to promote better airflow, but it requires moving some of the engine bay components, and some modification. If you are not willing to make these small changes, leave your engine stock. On the other hand, imagine 720 HP at the flywheel, and .41 better 1/4 mile e.t. and +8 mph, which has been reported on the corvette forum. No changes need be made to your Stinger-RZ system to add the Ram Air later.