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I'm with McReary in saying these "parts" are only truly effective when used together in a system. Intake flow and exhaust flow can be improved, but if the ECU cannot supply the extra fuel, lean conditions are created; more noise but no power increase. Now, if we can add the fuel with a good ECU flash or piggyback module, maybe we can get back our lost 30HP!!
An N52 reflash could perhaps be available for both Stock or Stage 1 (free flow intake/exhaust). In any case, the plug-and-play potential of these simple mods will only be known when someone can issue an ECU flash suitable for the mods I mentioned, and do a test with dyno or strip times.
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