Aries hi-performance muffler application.

[Great Lakes Greg]

I have been considering a hipo muffler from Aries. They advise against using one on a stock or modified engine producing less han 60 h.p.
I assume that would be because there is no disernible gain in power at that rate? It is also described as being slightly louder. Go deaf louder, or pleasently throaty louder? Thanks experts.