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I have the HKS SSQV4, and if you're going to get a BOV, you should get a chargepipe too... It would be pointless to get a BOV by itself unless all you wanted was noise. Chargepipe is prone to popping off on our car and breaking and leaking.
On another note, I love my HKS, I think it's the perfect amount of loud. It's only loud when you want it to be. I'll break down the noise level for you.
In-cabin/ windows rolled up
1-3 PSI Barely noticeable, you won't even hear it really unless you listen really hard. Not audible with radio on.
4-8 PSI You'll hear a little bit, but people on the outside will hear it for sure. Nice little vent, barely heard over the radio.
8 PSI+ nice strong whistle that can be heard in cabin over radio.
With the windows rolled down you can hear it every single time unless you shift ~2PSI. I chose the HKS bc I found that the Tial Q and Synapse BOV was barely audible at all.
If you're going for a nice unique sound, go for the HKS. If you want function go for the Tial Q. Synapse is just a middle ground for sound and function if you can't decide between the two.
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