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Ive had Blitz, teal, and Currently run the HKS SSQ. Not going to lie the HKS really performs well and also vents that pressure at low RPM from the turbo But theres nothing like the quality of a TIAL
I have a blitz and dont really hear anything. Im auto so maybe thats why.
It's also because you have your bov on the cold side. I have mine in the stock location (on the hot side) and it blows off all the time. Even when I'm not making boost.