the akra. is much more very low bassy sound... like a bass round smooth sound. the eisenmann have more roughness in it, roar sound... something like that.. If you come from a C63AMG I think u would love the Eisenmann much more I guess? I personally love the Eisenmann much more, and a friend of mine change from Akra. his first to Eisenmann now. The Eisenmann is much more louder, even tho the akra. is good as well. is all back to your own taste of sound. but the Eisenmann is so good. I order it already. cant wait!
Anyway C63AMG with IPE exhaust.DOPE! haha.