Try the Mazdaspeed (cat-back) exhaust made by Borla. I think it's J-Spec, but I could be wrong...
The construction is excellent (polished stainless steel) and has an aggressive 3" tip that doesn't scream pep-boy special. The sound is deep and throaty it rumbles instead of buzzing, like most other exhausts. I installed mine with the racing beat mid pipe, OBX 4 into one Headers and Injen CAI; it sounds great! A bit loud but only when you floor it; also get the Kartboy urethane exhaust hangers their great to keep the exhaust from moving.
Good Luck!