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The startup sequence has been common to most, if not all BMW engines for quite some time now. It's purpose is to heat up the catalytic converters faster. Engine mapping is changed, timing is a little different, mixture is a little different, all to make the exhaust hotter, heating the cats up faster, because they don't do what they do until they are above a certain temperature.
This is not done because it sounds cool. It is not done with exhaust flaps, and the increased volume is not just because the idle is held at a slightly higher RPM. In fact, on my car, the idle is not changed at all, yet it is a lot louder for about 45 seconds on startup. Purely done with engine mapping and purely done for emissions reasons. And if you have fake sound piped through your speakers, this is not coming from that.
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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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