I agree, get the Comptech exhaust, it has a low rumble at low RPM. Also, 3.5" tip is just right, you don't want a something that's too big.
As for lowering kit, I have Comptech springs with my setup and I don't have rubbing problems. Just stick to offset of about +45 to +50 and you'll be fine. I have +42 offset with no rubbing.
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Comptech Icebox, Headers, Exhaust, Lowering Springs and Sway Bars. Mugen front grille. Inspire tailamps. MOMO Sport 18 X 7.5 +42 offset. Axxis Metal Master front/rear pad. 2 Polk/MOMO 10" subs, Orion Xtreme 500.4 amplifier and Alpine CD changer.