Dont know with anyone here but I went with a custom y-pipe that is supposed to be more free flowing and went with a free flowing cat and can say that yes it does rev better on the top end but I've lost power below 4K. My 2-3 shift is now soft. 3rd does not pull the same in its lower ranges. I think if the car was a 3L then it would be fine but I think its probably just better if one sticks with the stock exhaust if they dont have a lot of mods. My only choice now is to do stuff that can get me some of the torque back.
