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Message: <blockquote data-quote="JC2008SportTrac" data-source="post: 1042450" data-attributes="member: 75816"><p>Bah, Roush and Saleen each use the same roots-style SC, do they not?  Do any company's out there use a twin-screw-style, like the Kenne Belle?  Or, do any of the companies use, instead, a centrifugal SC, or turbos?  I guess Roush and Saleen are taking a chance, adding a power-adder to the 4.6 V8 in the truck.  But this V-8 is already well-used in other power-adder situations.  I wonder if there's a big difference in the V-8 here, versus the 4.6 V8 3-valve in the mustangs..  I don't know, I'm asking if there are big differences (heads, fuel-delivery)?</p></blockquote><p></p>