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You really need the big bore headers like 45 or 50mm headers for a 900 with a tangential manifold and get rid of the standard X shape collector or otherwise its just noise and not much performance increase. Like Yorkie said, MADASL do some nice ones.
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 Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers! 
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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