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S4 with manifolds

                Hello , anybody here try RS2 header manifold on Audi S4 ?
   After I finish my exam, my family will go to USA. and I'm going to
   send draft to JOE HOPPEN MOTORSPORT INC. to order the manifold    next week.
                What should I expect from that 730$ manifold ?
    better respond or more peak power,or both ?