engine running a little rich/rough?????

Dude I bet they detuned your car and took horsepower away, or maybe you really do have a lemon… or well no. You put a paper filter and an exhaust on a 160hp economy car. Come on now, what did you expect? last time i checked (paper + stainless steal + sentra didnt = 900hp supra) Nismo this Nismo that looks like your going to run 16 flat…