[MikeK]

Originally Posted by Bill O'Brien

Does anyone know what the horespower increase will be with the Snyders 5.5 head? I am going to install mine in the next week! . . . I do have the Aries 'A Muffler' which should flow a bit better than stock.

Only the high-performance Aries has a higher flow rate. It is slightly louder, but not too noticeable. I've run both types of Aries. The regular Aries, either in plain or stainless steel, is identical internally to Henry's original. Here's what it looks like inside: