I have read many times that the most restrictive points in the 350Z exhaust are the cats and the Y-pipe.

I was thinking then, that what would be the result of leaving the factory catback, and installing and aftermarket Y-pipe (I don't know any), crawford cats and DCSport headers?

 

you never know how its going to sound....if your gonna open up the exhaust flow with those bolt ons....you mind as well finish it off with the bigger piping exhaust for most benefical gains