Kentmo, the turbosmart bpv gets loud when off throttle. There's no real way to quiet it down. It turns heads and can scare the crap out of people! The spring tightness does not really matter, at least did not feel any real difference. I try to keep at medium tightness most of the time. The biggest issue with turbosmart bpv I've had is that the piston inside gets dirty, dry and eventually gets stuck or leaking boost when full throttle. Even once a month cleaning and lubing did not help. So after my last track day and very leaky bpv I decided to try something different. It took me 6 months of waiting to finally receive the synapse diverter valve. I haven't gotten a chance to install it yet. Also haven't been driving the car due to winter so I am not in real rush plus need to cut off and weld on new flange for the synapse diverter valve.
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