I finally had a chance to have some fun with the new set up on the Z. I went from a single pop and specialty Z 2.5" exhaust with gen.1downpipes to a dual pop and full 3" specialty Z exhaust with the expansion down pipes. After Greg and Seb tuned it,it's hard to believe that it's the same car. It has lots more usable power and torque. It's definitely a lot more fun. It now makes me wonder what upgraded turbos and injectors would be like.