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Yup, it's all about getting the catalytic converters up in temp as soon as possible (to reduce emissions) by running the exhaust a little hotter. My M3 (non-turbo V8) does it also (it's about a 45 second process), as did my previous 2 BMW's (both non-turbo six's). It's underlying purpose is not for the sake of the turbos. It very well may be true that the waste gates are held open during this process so the turbos don't spin up when they are cold and don't have lubrication yet, but that is not the reason for the higher rpm and increased sound. The waste gates being held open would be a secondary function that they would have added later in the design and development process because it was a good idea, but that's not the reason for the startup process.
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M5C 20% tint, Xpel full front, partial sides and rear. Spacers, 15mm front, 12mm rear. Turner Motorsport Oil Cooler Guard.
M3: Active Autowerke filter, Dinan underdrive pulley, Dinan full exhaust and software, 3.45 Differential, Springs, Brakes, Dinan/HRE wheels, 275/30-19 w/10mm spacer, 295/30-19 w/3mm spacer, painted front reflectors, 30% tint, Escort 8500i & Lidar Jammer, LUX H8 V5 halos, Euro rear foglights, 3M ClearBra.
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