Erion or Two brothers?
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two bros between 4.5K and 5K is the best deepest sound and thats highway cruising (60mph), everything below that is deep aswell but not AS deep as between those particular rpms. once you get above 5K rpms it gets louder, but not as deep of a sound (NOT high pitched wining either!). then once you get to the double digit rpms it gets a LOUD deep sound .