Fellow Audians: when Messrs. Ritchey and Hoppen talk about an RS2 manifold and "a larger turbo" what turbo (manufactuer, model, etc.) are they talking about? I'm assuming the turbo's are 3K, but maybe I'm wrong. What turbo comes stock on a '91 200 20V Q? What turbo's can you upgrade too if you just do the RS2 manifold? TIA for your collective help and wisdom! GJ