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I would have thought it was quite the opposite.
By design the stock exhaust seems to be designed to ensure the gasses from left and right collide, and therefore, equalize, and therefore not drone.
Where as the after market toyo had no such feature and hence drone?
Who knows?
Jake must have studied this at length...maybe he will chime in?
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Don't care......was made to care! (my Mum)
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