i no ima dumba$$ but i bought the car with the 3.4 on with a c.a.i. and slp cat back. Sounds like **** IMHO but i dont beat on my car knowing what can happen and seeing pictures. I have 104's and a 180 degree t-stat. I was just wondering about the tune because i only have one day to spend at the shop cause i live far away and i dont no if he could get it done in one day. I no itll be running better but would i feel it in the butt dyno?