GLWS. I own one for my 09 650i. Works really well. It reminds me of the Sport button on the e46 M3 series cars. It just made the throttle more responsive. Last time I was to the shop, the tech asked me what upgrades I had done to the engine.
FYI guys - Sprint booster on a 650i is worth every penny. I had one on my 650i and it literally transformed the car. I could not drive it without the sprint booster on. (no relation to the OP)
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