Quote:
Originally Posted by GTR_Steve
The valve is spring fail open, vacuum to close (which disappoints a little as it is noisy on start up until vacuum takes hold
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Hah, that explains it. Just installed my Akra and was wondering why upon first crank it sounds louder before calming, totally makes sense!
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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