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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