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Do you have the Bosal on your WRX? Does it "drone" or resonate at certain MPH or RPMs inside the car? Currently I have about 50 mile trek to school one way, and don't want to be sitting over a air compressor the whole time.
Does the down pipe have the "bell-mouth" design or is it a blocked or flat plate style flange?
I don't have the Bosal or the helix dp. But if you are going to buy a turboback, the sound will be louder (although I have no idea how loud).
But if you are concerned about loudness or droning, I would recommend getting a Greddy Evo catback (along with the helix dp). Sounds great and doesn't drone at all. It also comes with a sound certificate if u purchase from an authorized dealer.