Originally Posted by Enough
Give it some time (couple of weeks) for the car to self adjust your fuel trims. This flat is normal for adding something which adds more air and creates a slightly different flow path over the MAF sensor. I felt the same right off idle low end flat spot and it corrected itself over time.
It's getting stronger.. today I smoked up the back tire. Did a huge burn out started on 2nd gr from dead stop. thanks everyone for chiming in. I guess it probably did take a few runs for the engine to re-map the change in air volume. best no tune mod ever!
Thanks Roto-Fab Here are my install photos: