A tailed beast uses its massive chakra reserve to turn anything from a roar or a wave into a powerful force of pressure and destruction. When Naruto Uzumaki was incontrol while using the Nine-Tails' power, he demonstrated powerful shockwaves by roaring or movement of his arms. When enraged or when the Nine-Tails took control of his body, he has been shown to use explosions with powerful wave of his arms. The raw force behind Naruto once he enters Version 2 was powerful enough to force Pain's Shinra Tensei back at him.
When used by Kurama itself, it's powerful enough to completely disperse powerful attacks like the Sage Art: Ultra-Big Ball Rasengan, and even knock back fully transformed tailed beasts.