I'd stay away from true dual exhauts, race cats, plenum upgrades if you want to keep the noise down. I'd change the endcans to 'any' of the ones out there. K1 system maybe? (with baffles in and take them out when ever you feel like it wanting to go a bit louder). If you like to hear the sound of the intake I'd go for a apexi drop in filter (so you dont messup the intake setup and heat being sucked into the engine)
Listen to these 3 clips
think these links are better for sound difference:
"standard":
before:
after: