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You can get a little more peak power from a S4 over a S5. The manifold is less restrictive, but the S5 is fully devided and has the best response. If you wanted to stay S4, if you keep your twin scroll and the switching actuator in the exhaust manifold, it will make the S4 turbo more lively down low, but will restrict a bit up top. Either turbo you will enjoy...
Bryan@BNR
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