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Perfectly normal, have it on mine, and here is why. The valve operates on vacuum. At first start it takes a second or two to build vacuum and hence why it starts loud (valve open), vacuum builds and it automatically closes it. So basically your cold starts are always valve open and the mechanical noise you hear is the butterfly closing.
Kinda annoying at times frankly when you are in a public/condo garage because the initial 2 secs upon cold start are really loud and gets other car alarms going.
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2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2018 Porsche 991.2 GT3: PtS, CXX, LWBS, PCCB
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods
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