There'll be no performance gain but suspect it'll be more durable when running higher boost (well past any sort of stage 1 stuff I mean) on the N54 engines. The manifold wont be designed for N/A applications, and wouldn't be better than the bmw manifolds. (that manifold has no disa flaps, so pulse tuning is fixed, and the runner length means it'd be tuned for mid-range torque not peak horsepower - of course that's not relevant in FI applications).