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hmmm...I thought the same thing. But the maker of mine is an aircraft mechanic and he stated the design of the opening and shaft actually increase the speed of the air, the external part you see is just the beginning of mine...the air shaft goes in another 5" directing the air where it needs to be.
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H.D. Smith
2009 997.2 S 3.8 PDK
2019 Ford Ranger Lariat FX4 Baby Raptor
2019 Can Am Renegade 1000R XC
2020 Yamaha YFZ450R
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