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I would say airbox may have some impact too, consider the SBK air box and how that works. Even intake bell mouth size can have an effect. I have the Beast TPO on my monster and these are considered an improvement over the stock S4 ones but the difference is negligible tbh.
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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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