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Guys, i just put a HKS SSBOV on my Greddy 3 row (running stock twins) The thing is pretty quiet. Is this b/c I've got stock twins running TTC (i really don't make more than 18 psi)

Has anyone had experience with the gold-colored insert, or perhaps the purple?
 

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Yeah, mine is surprisingly quiet too. I have mine on the hardpipe, with the spring as loose as it gets, and unless I'm boosting the full 18 pounds, its no louder than stock. Maybe I just cant hear it inside the car, because of the exhaust, but I was expecting more.

Under normal driving, accelerating and getting off it, it sounds stock.
 
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