Not Ranked
I know several folks who have popped 40 hp out of their Superformance using a Howe Racing collector and muffler. Not sure of the muffler model #, but jwoodard on the boards here has them.
They're 20% or so louder, but not ridiculous.
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MadMiles442 
She said, "The only thing I'll ask of you, you gotta promise not to stop when I say when..."
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