I installed the BMS Billet on my B58 540i with MPPSK this afternoon and have to say, the difference in sound is pretty significant for me.
At half- power acceleration I notice a pretty loud intake whistle / whoosh sound. At full chat the sound isn't much different than before. Perhaps a little more burble than before?
The only thing I'm not particularly happy with is the fit of the mounting bracket. No matter how much I adjust the various parts, I can't get the bracket to sit flush so it doesn't fill me with confidence. I'll have to keep an eye on it to make sure nothing is working loose.
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