I read though the performance sticky however I am still curious as to what options are available for the 05/06 awd sedans? I am really just looking for a catback for a better sound. Are there any performance gains to be had from a catback at all?

I've read around that the real only awd made exhaust is the stillen which is too pricey for me. Anyone have any ideas/experience with simple replacing the cats with high flows for a little more flow and sound and maybe a muffler for a little more sound?