I just did the UpRev tune on my Z, Speciality Z did my tune. The car made 308 whp and 254 wtq before the tune, and 318 whp and 260 wtq after the tune. Overall I felt the car pulled a little bit stronger after the tune. The interest thing is that after I installed the test piepes my exhaust tips were turing yellow, but after the tune yesterday, they are turning black~ I hope that's a good thing. Let me know if you know the reason why they are turning black, and if it's a good thing or not.
here is the video
YouTube - 370z tune