Akuma is capable of dishing out some seriously high stun numbers in Ultra Street Fighter IV while chucking plasma and delivering blows with his unique far standing roundhouse and other tools. NintenCore2000 took the Demon to the lab and figured out some ways to deliver enough stun to an opponent to result in a dizzy. Oddly enough, the first combo demonstrated only works against Akuma himself thanks to his low stun threshold.
The following option, however, works on a handful of cast members, though they are unlucky enough to share a still quite low 900 stun. After the defender has started seeing stars, Akuma can, of course, open up with a Raging Demon to push those damage numbers through the roof.
Source: NintenCore2000