How different are they interms of power on the dyno and on the strip?

Im torn between the Hyper medalion and the Racing medalion of Tanabe. Im really sick with straight pipes all over the metro thats why I insist on a chambered type like the Hyper medalion. Im just concern if ill gain more HP with a straight pipe like the racing medalion.

For looks on my car, i prefer the Hyper...im just not sure if a chambered muffler makes an engine slower than a straight pipe. Can anyone verify the numbers these two type of muffler makes?

Opinions are welcome. TY!