Jhill

Well required is a strong word. I wouldn't say required as I did my intake and exhaust and still picked up gains, if I remember right my peak gain were actually higher than my over shelf tuned gain but overall gain and safety air fuel ratio the shelf tune was much better. Oh and I was final custom dyno tuned in the end but the off the shelf tune was really close.

Now if asking is a tune worth it? Then yes the tune was much better for me. More response, more power down low, safer (no knock/ping) and a smoother idle as an added bonus which is noticeable (always wonder why oem are so eager to push idle speed to the limit that the engine is unhappy). After tune idle felt like a MB v8 that I have on multiple occasions been guilty of trying to start an already running engine (thank god the PCM controls the starter or I would have had some embarrassing moments in the shop).