Thread: BOV
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      04-11-2014, 03:30 AM   #17
SfValley335i
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Drives: Current:135i Sold:335i sedan
Join Date: Mar 2007
Location: City of Angels

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I've owned synapse bov, tial q and tial qr...

the synapse was loudest, almost like a bus.

Tial q is quiet and almost impossible to hear with the cowl installed, if cowl is removed you can hear the bov but nothing too pronounced.

I recently change to a tial qr... sound is much louder than the tial q, it sounds like synapse but a tad less sound.

tial q 3/10 loudness
tial qr 6/10
synapse 8/10


keep in mind, your tune plays a big role in sound. Cobb tunes run 19psi where as jb4 runs less boost aka less loud.
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