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You should defenetly be installing the GFB DV+ with optional main spring. Instead of fully discharging excess boost it only partially purges the ammount needed so you always retain some boost for when you need to rebuild it. This really enhances the way the car responds to throttle application, I love it.
As far as for sound, with the main spring there are some differences since everytime you let go off throttle you will hear the DV+, even if it was for less than a second, because of the partial boost purge at all time. As for the tone of the sound, it really isn't that difderent.
Other than that, get ready for a very messy and hectic job if you have a xDrive. I did a fully detailed guide for xDrive if anyone needs it.
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TOTALED  | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
2015 E84 X1 35i M-Sport
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