Originally Posted by 1hotfocus
Header then data log. There's no point to a tune if its not custom (requires a datalog)
Sent from my SAMSUNG-SGH-I717 using FF Mobile
I have never datalogged mine and it runs like a champ. They have done so many of our gens that they know where to set the tune at. I highly suggest you install the tune first otherwise your car will have a CEL code for the second cat having a fault because it is no longer used when you go header.
Your tune can be fine tuned after you have both the header and tune installed but as I stated mine has never been datalogged and Randy at FSwerks has adjusted my tunes several times for other things such as increasing the transmission pressure(=