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I have the Berk street and I think the loudness is fine with the stock DP and MP. A lot of people who added a full turbo-back later found it got a little too loud though. You won't hear much spool without downpipes. I don't notice any major drone, but my commute is short and I don't drive on the highway much. I do notice a little of the "blowing through a straw" sound at high throttle but it isn't too bad. A lot of 135 exhausts make a similar sound. I considered the MadDad Whisper too, but it is a bit pricey for my mod budget and I got a used Berk super cheap.
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