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Message: <blockquote data-quote="ALBundy" data-source="post: 138666" data-attributes="member: 15">I think we should have a specific thread dedicated to the questions/viability of having piggyback ECUs and ECU re-programmed. MrSamdol, bottom line is this, an ECU-reprogramming is more than what you have mentioned. An ECU with Superchip, Hiop Chip, Dinan, Jim Conforti chip and etc will no doubt increase the vehicle's torque and hp output. This is achieved by altering the stock ECU's air fuel mixture mapping and also advancing the ignition timing. Now you have asked indirectly, why BMW didnt go the extra mile to extract these possible improvements in the engine performance?? The answer is, BMW manufactures cars for all over the world and the gas octane level varies depending on which country. IN Malaysia we have RON 92 and 97. In the states, they have Ron 87, 92 and 95 if I remember correctly. Some countries dont even have RON95 and so forth.An ECU with an aftermarket chip requires the owner to use RON92 and above, anything less may cause pinging/knocking and probably wouldnt achieve the desired results. So BMW ECUs are made in such a way to ensure they can run on low octane gasolines and hence the ECU is programmed to accomodate that. Rgds</blockquote>