Dubz, you're stock headers are the same as mine! Our cars are those rare PZEV vehicles, 163hp instead of 168 (I was shocked when I found this out about my car not long ago.) I went with some OBX equal length headers I found on NASIOC from an impreza RS. To be honest, I wasn't going after a nice sounding header as much as one that would net me more power (OBX headers are great for power on N/A Subarus.) But even with these EL headers, my car actually does have a bit more boxer rumble because these are not symmetrical and are better for exhaust flow. The headers you have currently will not work because although you can get an impreza RS header on an N/A legacy, WRX headers and impreza RS headers are not interchangeable. I even had to get mine modified to fit. I'm not sure if there are any UEL headers that are anything like your car's headers. Look up H6 OBX headers on ebay. That might be your best bet as far as the closest fitting aftermarket header.
Last edited by kred; 07-05-2013 at 10:42 PM..