If noise is a big concern you can get a semi divorced DP. It's pretty much a DDP where the wastegate dump is plumbed back into the exhaust down past the firewall. (N/m, I see you already saw the semi-divorced DPs)
DDP's can be quite loud, but it depends on the car, the engine load, the amount of boost and so on. They're usually not too loud at part throttle boosting, but like I said, it depends on the car.
Personally, if I ever decide to ditch my HKS, I'll be going with a semi-DDP.... I prefer quiet and my car is already way too loud for my tastes.
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