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Then I've got Fister Stage 3.75! (Motorsound mufflers to Stage III and Motorsound Air Box)
Ha,ha. I like your thinking. Stage IIs still retain
the factory internal crossover pipe, so Stage II motorsound muffs do have a larger internal crossover. Stage IIIs have no factory internals and are repiped with new stainless, so Stage III mufflers are all the same whether or not they started life as motorsound.