I have a 2007 Mazda 6 2.4L hatchback and im looking for a performance exhaust to install. Im open to full exhaust system to only mufflers. Currently has stock true dual on it. Looking for a ricer sound but a grumble. Nothing exceptionally loud. Dont want to attract the cops to much

 

There used to be aftermarket exhausts for the 6 series, the early 6 series cars, mostly axle back systems and even then they were few and far between.
Your best bet if you want a little more sound (and/or a nice tip) is to go to a muffler/exhaust shop and see what they can do. It will liable be a lot cheaper than an AM exhaust as well. As I remember, the one's I knew of were quite pricey.
On the other hand, a quick search turned up some options. I found three sites, five systems that 'should' fit your car, and know little to nothing about any of them.
Have a look for yourself:
1. 17340 - Auto Parts Warehouse
2. APEXiŽ WS II Exhaust System 02 08 Mazda 6 Sedan 4 cyl. 116-KZ01
3. Exhaust Systems for the Mazda 6 | HorsepowerFreaks