I would not get a DV from them as their aftermarket unit is OLD techonology. Your new dub has an electronically controlled DV which actuates a lot quicker then a mechanical unit ever will, not to mention that the Forge unit is a piston based DV which must be serviced/lubed every so often.
The OEM DV is 100% perfect and does NOT need to be changed. If you want something that increases the sound, get an intake or buy a DV Spacer that allows you to recirculate the air AND vent some to atmosphere.