If your looking for performace and haveing duals go with 2in-2.25in piping and use the stock V6 mufflers (or from the V to mufflers) It will keep enough back pressure for some kinda gain and keep the sound down also. Or the TL mufflers what even you want. I think it would look great, nice and stock looking with some gain and might have a nice sound. Who knows you ight get a good performance gain?? Just as long as you dont go anything over 2.25in piping from cat-back