I have a 2003 Mazda 6, and its been awhile since i've been in the modified car scene. I am looking to get a new exhaust for my car, something that sounds a little bit more agressive, and I am also looking for something that can help the handeling in my car, any suggestions or websites to get me started. Thank you

The 2003 has a lot more performance options than my 2005 :( But that means you have simple/cheap options like Short Rams and Cold Air Intakes (100-300), as well as exhaust headers (DC Sports - 500) and cat-backs (try Magnaflow - 700). Sites like car-stuff.com and raceinspired are good for these kind of things.