I had the same on my 06 STI. As already mentioned, part of it is the resonated section that joins the back box. Remove that and replace it with a non res pipe (about £100 if I recall correctly). I then changed my back box for a TSL group N and later an afterburner vortex. It then had the burble back, though I dont think you will ever get it sounding as deep as the 2.0 models. Stll sounded a million times better though.
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10 Years of Scoobies:04 WRX SL, 06 HAWK STI, 97 JDM WRX STI WAGON, 05 WRX STI, MK3 FOCUS RS, now Porsche Cayman S
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